Citation styles can be difficult to learn.
Here are links to guides for some of the most popular style guides.
This guide is from OWL, the Purdue Online Writing Lab. It provides a summary of the APA style guide.
APA (American Psychological Association) is most commonly used to cite sources within the social sciences. This resource, revised according to the 6th edition of the APA manual, offers examples for the general format of APA research papers, in-text citations, endnotes/footnotes, and the reference page.
When using APA format, follow the author-date method of in-text citation. This means that the author's last name and the year of publication for the source should appear in the text, E.g., (Jones, 1998), and a complete reference should appear in the reference list at the end of the paper.
If you are referring to an idea from another work but NOT directly quoting the material, or making reference to an entire book, article or other work, you only have to make reference to the author and year of publication in your in-text reference.APA style requires authors to use the past tense or present perfect tense when using signal phrases to describe earlier research. E.g., Jones (1998) found or Jones (1998) has found...
Descriptions for Style Guides (APA)
Russell, T., Angeli, E., Wagner, J., Lawrick, E., Moore, K., Anderson, M., Soderland, L., & Brizee, A. (2010, August 1, 2010). General format. Retrieved from http://owl.english.purdue.edu/owl/resource/560/01