Article: Use a program such as Disk Cleanup to remove temporary files, system files and a variety of other files that you no longer use.  Open the Start menu. In the Search box, type cleanmgr. Click the Cleanmgr program. Specify the drive you would like the program to clean up. Click OK. This will start the process. This program repairs performance issues related to your Windows PC and speeds up slow computers.  Click the Start button. Click on “Control Panel”. Under “System and Security”, click “Find and Fix Problems”. Click “Check for performance issues”. A Performance Wizard window pops up. Click “Next” and wait for it to diagnose the problem. In the event that the troubleshooter recommends that you check programs to tweak PC performance, click “Next”. Clicking the “View detailed information” lets you access the detailed troubleshooting report. If you wish to close the wizard, you simply need to click “Close”. Unused programs can end up taking a lot of space on your computer, thereby reducing its performance, over a period of time. It is advisable to delete such programs.  Click the Start button. Click on “Control Panel”. Under “Programs”, click “Uninstall a program”. This will bring up a list of all your programs. Click the program you wish to remove and click “Uninstall”. You will find this tab on the top of the menu. Many programs are designed to run automatically at startup. While this is convenient for programs you use often, unnecessary software running at startup could guzzle down memory, eventually slowing down your PC. You can manage startup programs in several ways.  Press Win-r on the desktop. In the “Open” field, type msconfig. Press Enter. Click Startup. Uncheck the items which you do not want to launch at startup. Once you are done, click OK. In the popup box that appears next, click Restart. This will restart your computer, to finish the process. Regularly defragmenting your hard drive organizes the files in your computer, creating more space in the drive. Disk Defragmenter is a great built-in tool, designed for this purpose.  Click the Start button. In the Search box, type Disk Defragmenter. Click Disk Defragmenter. Under Current status, select the disk you wish to defragment. Click Analyze disk. This will let you know if you need to defragment that particular disk. After Windows is done analyzing the disk, it shows you the percentage of fragmentation on the disk. If that number is above 10 percent, you should defragment the disk. Keeping too many programs open at one and the same time can bring down your PC’s performance. Try to work with fewer programs at the same time.  Press Ctrl+Shift+Esc to open the Task Manager. Click Processes. This will let you see the list of processes running on your PC. Scroll down to view the entire list of programs. Check the name and description of each program to identify it. Check the Memory column to see how much memory is being consumed by each process. Right-click on any active process and choose “End process”. This will close the program. Running two or more antivirus programs could slow down your computer over a period of time. The Windows Action Center will usually notify you if you are running more than one antivirus program. Restart your computer at least one a week. This helps clear memory and properly shuts down all programs running in the background; with or without your knowledge.
Question: What is a summary of what this article is about?
Clean up your hard disk. Run the Performance troubleshooter. Uninstall and delete unused programs. Limit programs at startup. Defragment your hard disk. Run fewer programs at a given time. Run only one antivirus program. Regularly restart your PC.

To start an APA citation, begin with the author's first name and last name. Then, add a period. For example, say you're citing Mrs. Dalloway. You would begin your citation with, "Woolf, Virginia." In APA citations, the year of publication comes next. It should be in parentheses and the parentheses should be followed by a period. For example, "Woolf, Virginia. (1953)." From here, you'll add the name of the book. This should be in italics and followed by a period. For example, "Woolf, Virginia. (1953). Mrs. Dalloway." Now, you'll need to add information regarding where the book was published. This can also be found on the first few "pages." It may also be listed in the general information on the site where you purchased or borrowed the book. You would add the city where it was published, followed by a comma. You would then add the abbreviation for the state of publication. Add a colon and list the publisher. For example, "Woolf, Virginia. (1953). Mrs. Dalloway. New York City, NY: Houghton Mifflin Hartcourt Publishing." How you cite an e-book depends on where you obtained the e-book in APA style. If you found the e-book on an online library or database, you would either list the Digital Object Identifier (DOI) or the URL for that database.  You can find a book's DOI when checking the book out from a digital library. It's a long string of numbers broken up with dashes and periods listed with other details about the book, always labeled as the DOI. Add this number to the end of your citation. For example, "Woolf, Virginia. (1953). Mrs. Dalloway. New York City, NY: Houghton Mifflin Hartcourt Publishing. doi: 1234/5678/9101.1234" Not all ebooks have a DOI number listed. If you cannot find the DOI number, simply write "Retrieved from" and add the URL of the online library where you obtained the source. For example, "Woolf, Virginia. (1953). Mrs. Dalloway. New York City, NY: Houghton Mifflin Hartcourt Publishing. Retrieved from www.onlinelibrary.org." You may have purchased your book online, or received it from a free database. In this case, you would write "Retrieved from" at the end your citation. Then, include the website where you purchased the book or where you downloaded it for free. For example, "Woolf, Virginia. (1953). Mrs. Dalloway. New York City, NY: Houghton Mifflin Hartcourt Publishing. Retrieved from www.amazon.com".
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One-sentence summary --
Write down the author's last name and first name. Add the year of publication in parenthesis. Write the name of the book in italics. Add information about where the book was published. Cite a book from a library database. Cite a book bought or obtained for free online.