Here are some very basic examples of citing journal articles in the three different styles. This is by all means NOT comprehensive. Please refer to the individual manuals for further assistance.
Examples used from PURDUE OWL
Information needed for all citation styles, to cite journal articles
from IUPUI campus guides
Last name, First Name. "Title of article." Title of Journal Volume Number, issue number (Year): Page Numbers.
MacDonald, Susan Peck. “The Erasure of Language.” College Composition and Communication 58, no. 4 (2007): 585-625.
ELECTRONIC JOURNALS: Same as print but add when accessed and URL or DOI.
Bent, Henry E. "Professionalization of the Ph.D. Degree.” College Composition and Communication 58, no. 4 (2007): 0-145. Accessed December 5, 2008. http://www.jstor.org/stable/1978286.
Kossinets, Gueorgi, and Duncan J. Watts. “Origins of Homophily in an Evolving Social Network.” American Journal of Sociology 115 (2009): 405–50. Accessed February 28, 2010. doi:10.1086/599247.
Author(s). "Title of Article." Title of Periodical Day Month Year: pages. Medium of publication.
Poniewozik, James. "TV Makes a Too-Close Call." Time 20 Nov. 2000: 70-71. Print.
ELECTRONIC JOURNALS: Same as print, provide the medium of publication that you used (in this case, Web) and the date of access.
Wheelis, Mark. "Investigating Disease Outbreaks Under a Protocol to the Biological and Toxin Weapons Convention." Emerging Infectious Diseases 6.6 (2000): 595-600. Web. 8 Feb. 2009.
Langhamer, Claire. “Love and Courtship in Mid-Twentieth-Century England.” Historical Journal 50.1 (2007): 173-96. ProQuest. Web. 27 May 2009.
from Washington State University
Author, A. A., Author, B. B., & Author, C. C. (Year). Title of article. Title of Periodical, volume number(issue number), pages. http://dx.doi.org/xx.xxx/yyyyy
WITHOUT DOI (URL)
Author, A. A., & Author, B. B. (Date of publication). Title of article. Title of Journal, volume number. Retrieved from http://www.journalhomepage.com/full/url/
Scruton, R. (1996). The eclipse of listening. The New Criterion, 15(3), 5-13.
Kenneth, I. A. (2000). A Buddhist response to the nature of human rights. Journal of Buddhist Ethics, 8. Retrieved from http://www.cac.psu.edu/jbe/twocont.html
Brownlie, D. (2007). Toward effective poster presentations: An annotated bibliography. European Journal of Marketing, 41, 1245-1283. doi:10.1108/03090560710821161