APA style is most frequently used in the social sciences. It is designed for reporting the results of original research, but is also used for other types of research in many disciplines.
APA gives guidelines on creating a title page, in-text citations, headings, a reference list, and tips on style and mechanics.
In APA style, the references are listed in alphabetical order at the end of the paper. Only list sources that you have actually referred to in the text of the paper.
In-Text (Parenthetical) Documentation
In-text parenthetical documentation is embedded within the text of the paper. Parenthetical references give the source for ideas that you have summarized, paraphrased or quoted. These resources must also appear on your references page at the end of the paper.