By 
APA (American Psychological Association) is a citation style most commonly used for citing sources for articles within the social sciences.
Citing sources in the text in APA Citation
When referring to a work or a work citation, you must cite APA in the author-date-page number format, for example (Freud, 1927). The author’s last name and the year of publication should be used when citing the source within the text. If the author is already mentioned in the sentence, it is not necessary to mention the author again, just insert the year of publication in parentheses after the author has been mentioned.
The page number should follow before the sentence period, for example. (p. 00)
For instance:
According to Freud (1927), “religion is comparable to an infantile neurosis” (p. 53).
Freud (1927) compares religion to an infantile neurosis (p. 53).
He said: “Religion is comparable to an infantile neurosis” (Freud, 1927, p. 53) with which I do not agree.
APA Works Cited Page
At the end of your article, you should have a page of works cited in APA Citation. It should start on a new page and should be titled “References.” It should be centered at the top of the page. Do not bold, underline, or put quotation marks in the title. Some use a cited APA Works generator, but it is usually done manually.
General rules of the reference list in the APA citation:
The space must be double.
The entry indentation must be a French indentation.
List entries alphabetically by the author’s last name.
If you have multiple sources by one author, sort them starting with the oldest publication.
Capitalization:
Capitalize main words for magazine titles only. Do not capitalize prepositions / conjunctions unless they are the first word of the title / subtitle.
For books, chapters or articles in books and magazines, or web pages, capitalize only the first letter of the title and subtitle.
Capitalize proper names.
Italics:
Italicize the titles of longer works, such as books and magazines.
Shorter titles of works, such as poems, stories, magazine articles, and essays, should not be italicized, underlined, or enclosed in quotation marks.
APA quotes
BOOKS listed APA
Basic format:
Author Last Name, First Name Initial (s). (Year of publication). Title of the work: Capital also for subtitle. City, state Abbreviation: Editorial.
If you are not in the US, enter the city.
An author:
Moran, A. (2012). Sport and Exercise Psychology: A Critical Introduction (2nd Ed.). London: Routledge.
If it is a different edition than the first, simply add the edition in parentheses after the title of the work.
Two authors:
Write the authors by their last names and initials; use the ampersand instead of the word “and”.
Kitchener, KS and Anderson, SK (2012). Foundations of ethical practice, research and teaching in psychology and counseling. London: Psychology Press.
From three to seven authors:
Separate authors with a comma. The last author must be preceded by an ampersand instead of “and”.
Keith-Spiegel, P., Whitley, BE, Balogh, DW, Perkins, DV and Wittig, AF (2002). The ethics of teaching: a case book. London: Psychology Press.
More than seven authors:
List the first six followed by a “…” first and then list the last author. It is not necessary to use the ampersand.
Keith-Spiegel, P., Whitley, BE, Balogh, DW, Perkins, DV, Miller, FH, Harland, AA, … Wittig, AF (2002). The ethics of teaching: a case book. London: Psychology Press.
Chapter or article of an edited book:
Only the first word of the chapter title and subtitle should be capitalized. Only the first word in the book should be capitalized. For multiple authors, follow the format above. For multiple editors, separate them with commas and ampersand where appropriate.
Seligman, M. (1992). Positive psychology, positive prevention and positive therapy. In Snyder, CR and Lopez S. (Eds.), Positive Psychology Gender Manual. (pp. 107-123). Philadelphia, PA: University of Pennsylvania.
MAGAZINE ITEMS on APA Style Quote
The magazine is italicized with all main words capitalized. The title of the article should only have the first word capitalized.
The basic format:
Author’s last name, AA (year of publication). Title of the article or chapter. Magazine, volume (edition if available), pages.
Brandon, N. (2012). Predict persistence, non-persistence, and recent initiation of non-medical opioid and stimulant use in adolescents. Addictive Behaviors, 37 (6), 716-721.
Two authors:
How would you quote APA in a book. Separate with an ampersand.
Brandon, N. and Rogers, P., (2012). Predict persistence, non-persistence, and recent initiation of non-medical opioid and stimulant use in adolescents. Addictive Behaviors, 37 (6), 716-721.
For three or up to seven authors, follow the authors list of how you would do the book to cite in APA. The same rule applies to seven or more authors.
Online book:
Use “nd” if there is no date available. Include the full URL where readers can find it.
Smith, D. (2008). Where to find happiness. Available at URL_GOES_HERE
NEWSPAPERS listed APA
Print:
Newspaper articles are usually several pages long. If there is only one page, use p. For multiple pages, use pp. for an APA quote.
Example
Single page: p. A2
multiple pages: pp. C2, C5-C7
Mention the full date (year, date of the month), for example. (2006, March 26)
Example of APA quotes:
Richards, S. (2007, April 28). Alcoholic policies around the world. Washington Post, pp. 2A, 3A.
Online:
Include the full URL
Tierney, J. (May 16, 2011). A new indicator to see what lies beyond happiness. The New York Times. Retrieved from URL_GOES_HERE
MAGAZINE listed APA
Basic format (print):
Borgia, M. (2000, April 9). Passing the mark for global schools. Newsweek, 135, 26-28.
Online:
Use np if a publisher name is not provided and nd if a publication date is not available. Add the full URL to cite in APA.
Ronalds, TM, Peters, A. and Ricci, D. (2008). Abnormal eating among adolescents. Cosmopolitan Online, 10 (3), 35-36. Obtained from
URL_GOES_HERE
WEBSITE listed APA
Include the date of access because the websites are updated frequently. Add the full URL of the site.
Use nd if a publication date is not provided.
Author, A. (Date if available). Title of the document / article / page. Retrieved from URL_GOES_HERE
Evans, E. (2010, May 5). Soup for the soul. Retrieved from URL_GOES_HERE
Evans, E. (undated). Soup for the soul. Retrieved from URL_GOES_HERE