There is now one standard, universal format that researchers can use to create their citations. You will create a citation by following MLA's list of core elements which are assembled in a specific order. The MLA core elements are:
Template for the Work Cited Entry:
These online sources from the APA Style website and two Online Writing Labs (OWLs) contain information and examples on how to write an APA-style student paper, references and in-text citations. These are good sources for double checking references and in-text citations.
The APA Style website is a great place to guide you in formatting your paper.
For more details see pages 29–67 in the APA Manual.