PURDUE OWL APA FORMATTING GUIDE
http://owl.english.purdue.edu/owl/resource/560/02/
http://owl.english.purdue.edu/owl/resource/560/03/
http://owl.english.purdue.edu/owl/resource/560/05/
http://owl.english.purdue.edu/owl/resource/560/06/
http://owl.english.purdue.edu/owl/resource/560/07/
http://owl.english.purdue.edu/owl/resource/560/08/
http://owl.english.purdue.edu/owl/resource/560/09/
http://owl.english.purdue.edu/owl/resource/560/10/
http://owl.english.purdue.edu/owl/resource/560/11/