APA refers to Internet sources as "electronic" sources. The most commonly cited types of electronic sources include entire websites and newspaper, magazine or scholarly articles published online. Some other Internet sources include blog entries, message board posts, wikis, dictionaries, encyclopedias and online videos.
Provide as much information as possible when citing your Internet source on your reference page. The idea behind a citation is that the person reading your paper will be able to locate the sources you used given only the information listed in your references. Begin with the author's last name, a comma, the author's first initial (and middle initial, if applicable) and a period. Next, put the year of publication in parentheses followed by a period. Follow this with the title of the website or article in sentence case. If the article is from a journal, include the journal's name, volume and issue numbers next. Finally, insert the phrase "Retrieved from" and follow that by the Internet page's URL, including the initial "http://" portion. For example: Smith, R. (2011). Citing webpages: A general guide. Retrieved from http://www.citations.com (do not place a period after the URL).
Include as much information on your reference page as you can so the reader can locate the webpage. If you have no author or no date, begin the citation with the title of the webpage and insert "n.d." in the parentheses where the date would normally go. For two through five authors, list all last names/first initials, separating them with commas and including "&" before the final author's name. For six or more authors, insert only the first author's name followed by "et al." and then the date in parentheses.
Immediately following specific information -- whether you paraphrase or use direct quotes -- include an in-text citation to give credit to the source. Before the period at the end of the specific information, insert parentheses and, within them, type in the author's last name, a comma and the year of publication. For example, "Here is the quoted data" (Smith, 2011).