http://owl.english.purdue.edu/owl/resource/560/01

http://www.apastyle.org/

http://en.wikipedia.org/wiki/APA_style

http://www.ccc.commnet.edu/apa/

http://owl.english.purdue.edu/owl/resource/560/08/

http://www.vanguard.edu/faculty/ddegelman/index.aspx?doc_id=796

http://www.lesley.edu/library/guides/citation/apa.html

http://www.liu.edu/cwis/cwp/library/workshop/citapa.htm

http://www.psywww.com/resource/apacrib.htm

http://www.apastyle.org/aboutstyle.html