Oftentimes, a textbook might be an anthology or collection of work from many authors. In these instances, the editor or editor is given the lead spot in the citation. List the first editor in LastName, FirstName format and any additional editors in FirstName LastName format. Follow one name with the abbreviation "ed." and multiple names with "eds." End with a period.  Doe, John, ed. Rowell, Alex, and Will Hoffman, eds.
++++++++++
One-sentence summary -- Introduce the editor or editors.

Q: If you're substituting powdered buttermilk for actual buttermilk, the amount you need will vary by brand. Check the label of your powdered buttermilk. However, as a general rule of thumb, you usually substitute 1/4 cup of buttermilk (60 mL) mixed with 1 cup of water (240 mL) for every cup (240 mL) of buttermilk in a recipe. When substituting powdered buttermilk for liquid buttermilk, follow the recipe as you normally would. Simply add your mixture of powdered buttermilk and water when you would normally add the buttermilk. The recipe should turn out more or less the same. Liquid buttermilk, or powdered buttermilk mixed with water, is usually added while you're mixing ingredients like eggs or butter. However, if a recipe calls for powdered buttermilk, it is added to the dry ingredients. For baked goods, you mix the buttermilk in with flour, baking soda, salt, dried spices, and any other dry ingredients used.
A: Substitute powdered buttermilk for liquid buttermilk. Bake your recipe as usual. Mix your buttermilk into the dry ingredients if a recipe calls for it.

Article: Some people feel that what you use to keep your diary in isn't important. For some, this may be true. For many people, however, having a diary that feels right makes it easier to write.  Go shopping for diaries at a store so you can pick up and examine different choices, holding them in your hand to get the feel for each. Choose something that is appealing to you, but not so pretty you'll be afraid to write in it or get it messy. Writing in a diary isn't all about being neat and orderly. The best diaries are often messy and jumbled. Consider the size of your diary. Many people like to carry their diaries with them. If you anticipate this, a smaller choice might be right for you. On the other hand, if you plan on doing artistic, scrapbook style layouts, you'll probably need something a little bigger. Similarly, some people find it easier to write with some particular type of pen. If a cheap disposable feels fine to you, don't worry about it, but if you prefer a nicer pen, pay a little extra for something you'll feel good writing with. Again, visit a store such as an art supply shop and try out different pens. See what feels best for you. The idea here is to make you want to write, so you can keep up the habit daily. Not everyone who keeps a diary does so on paper. While many people find they are more creative and focused writing in a physical book, others are content to keep a diary online.  An online diary avoids the risk of loss. On the other hand, there is always the risk that it could be hacked, or the server might crash. Consider the pros and cons and decide what's right for you.  If you opt for an online diary, there are numerous options available such as Livejournal, Penzu, or Diary.com. Some of these websites allow you to make some of your writing public while keeping other material private.
Question: What is a summary of what this article is about?
Find a diary that is appealing to you. Experiment with different pens. Consider online journaling.

Problem: Article: To see if you have an overbite, let your mouth close normally, your teeth resting in their natural position. With your teeth clenched shut, smile into a mirror and look for areas where one row of teeth overlaps another. Though some very slight overlap is normal, seek medical attention if your teeth seem severely misaligned. Overbite is considered severe when the teeth overlap by 3.5 millimetres (0.14 in) or more. For accurate measurements, visit your dentist or orthodontist. If you’re not sure whether your overbite requires medical attention and aren’t ready to spend money on an orthodontic screening, check with your dentist. Ask for a dental checkup or exam, in which the dentist looks at the condition of each individual tooth and your general dental health. If the option is available, ask for an x-ray to see if you have one of the following types of malocclusion:  Class 1 malocclusion, where the bite is normal but the top teeth slightly overlap the bottom teeth.  Class 2 malocclusion, where the bite is not normal and there is severe overlap. Class 3 malocclusion, where the bottom teeth overlap the top teeth. An orthodontist will be able to tell you what’s necessary to fix your overbite, how much it will cost, and how long it will take. Look for individuals who have a Doctorate of Dental Surgery (DDS) and have completed a 2 to 3 year orthodontic specialty program. Before undergoing treatment, confirm that your orthodontist is registered with the American Board of Orthodontics. If you have trouble finding local orthodontists, ask your dentist for in-network recommendations.
Summary: Check your teeth alignment by biting down and smiling. Get a dental checkup. Find an accredited orthodontist.

Article: Steroids are injected straight into the scar tissue to help decrease itching, redness, and general discomfort. Some doctors note that the treatment of these symptoms with steroidal injections can also reduce the appearance of scars. Steroid injections (triamcinolone) are given every two to six weeks until improvement is seen. Occasionally, injections can cause a network of surface veins to develop (telangiectasias), or lightening or thinning of the surrounding skin. Research has shown that cryotherapy can decrease the thickness of the scar tissue by up to 58%. The earlier the treatment and thinner the keloid scar, the better the results. Cryotherapy is performed in the physician office using medical instruments that instantly freeze the tissue and kill it on contact.  Cryotherapy can cause burns, more scar formation and damage to nearby healthy tissue if done improperly. When cryotherapy is used to treat keloid tissue, further preventative methods must be used as the area heals, such as silicone dioxide, silicone gel sheets and steroid injections. Another option for reducing the appearance of keloid scars is radiation therapy. Some plastic surgeons avoid this method of scar removal due to concerns about causing tumors, but studies have shown that this is a safe method as long as surrounding tissues are protected. By itself, surgery can often cause further aggravation and create more scars, but if performed in combination with a number of other treatments (e.g. silicone sheeting and silicone dioxide), surgery can reduce the visibility of such scarring. Once the surgical excision has healed, discuss the use of silicone gel sheets to reduce the recurrence of the scar formation. If you decide to go the surgical route, ask your doctor about Imiquimod. It is a cream that enhances healing and is often used after surgery to prevent scarring. The cream is applied on alternate nights for eight weeks after surgery. Although the trials have been small, the post-surgical recurrence rate averaged only 28 percent over a six- to nine-month follow-up period, with best results (2.9 percent recurrence) in low skin tension areas such as earlobes.
Question: What is a summary of what this article is about?
Ask your doctor about steroid injections. Try cryotherapy. Ask about radiation therapy. Discuss surgical excision with your doctor.