American Psychological Association (APA)
APA (American Psychological Association) style is most frequently used within the social sciences, in order to cite various sources. This APA Citation Guide, revised according to the 6th edition of the APA manual, provides the general format for in-text citations and the reference page. For more information, please consult the Publication Manual of the American Psychological Association, (6th ed.).

Book with Single Author:

Gore, A. (2006). An inconvenient truth: The planetary emergency of global warming and what we can do about it. Emmaus, PA: Rodale.

In-text reference:

(Gore, 2006)
Book with Two Authors:
Michaels, P. J., & Balling, R. C., Jr. (2000). The satanic gases: Clearing the air about global warming. Washington, DC: Cato Institute.

In-text reference:

(Michaels & Balling, 2000)
Reference Edited Books (signed):
Schneider, S. H. (2000). Greenhouse effect. World book encyclopedia (Millennium ed. Vol. 8, pp. 382-383). Chicago, IL: World Book.
In-text references: (Schneider, 2000)

Magazine Articles:

Begley, S., & Murr, A. (2007, July 2). Which of these is not causing global warming? A. Sport utility vehicles; B. Rice fields; C. Increased solar output. Newsweek, 1-5.

In-text references:

(Begley, 2007)
Newspaper Articles (unsigned and signed):
College officials agree to cut greenhouse gases. (2007, June 13). Albany Times Union, p. A4.
Landler, M. (2007, June 2). Bush’s Greenhouse Gas Plan Throws Europe off Guard. NewYork Times, p. A7.
In-text references: (“College Officials”, 2007); (Landler, 2007)

Journal Article:

Miller-Rushing, A. J., Primack, R. B., Primack, D., & Mukunda, S. (2006). Photographs and herbarium specimens as tools to document phonological changes in response to global warming. American Journal of Botany, 93(2), 1667-1674.
In-text reference: (Miller-Rushing, Primack, Primack, & Mukunda, 2006)
If DOI link:
Mora, C., & Maya, M. F. (2006). Effect of the rate of temperature increase of the dynamic method on the heat tolerance of fishes. Journal of Thermal Biology, 31(3), 337-341. doi: 10.101b/jtherbio.2006.01.055
In-text reference: (Mora & Maya, 2006)


United States Environmental Protection Agency. (2007). Climate Change. Retrieved from: http://www.epa.gov/climatechange
In-text reference: (United States Environmental, 2007)
APA Referencing


Single author:

(Author, Year) - (John, 2016)
In sentence case
Author (Year) - John (2016)
For Double authors
(Author 1 & Author 2, Year)
In sentence case
Author 1 and Author 2 (Year)
Below Six authors, we use all authors name as to be mention
(John, Koch, Seal, Guba, & Lincoln, 2016)
In sentence Case
John, Koch, Seal, Guba, and Lincoln (2016)
Above Six authors, we use et al.
(John et al., 2016), John et al., (2016)