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What is the point of a citation?
You need to understand why and how to use citations to help you avoid plagiarism! Use this interactive tutorial to begin to understand the importance and mechanics of avoiding plagiarism through proper citing:
In addition to avoiding plagiarism, citations help the reader locate your sources. You need to ask yourself, could someone find this information in the future? A client's personal file would not need a citation because your reader cannot go find that information again. Census statistics would require a citation because your reader could go locate that information again.
APA requires FOUR ELEMENTS of every citation:
Follow this guide if any of those elements aren't available: http://blog.apastyle.org/apastyle/2012/05/missing-pieces.html
Use Crossref, a free site, to look up DOIs. The free DOI lookup searches for DOIs using information such as article title, authors, and publisher information.
Web-based citation managers that allow you to import references from text files, web sites or online databases.
Choose the APA example that is most like your source and follow that format. Sometimes you will need to combine elements of more than one reference format.
This entry from the APA Style blog has more information about what to do.
Slides from the latest APA workshops.
Here's a sample paper provided by APA. For every style rule, there is a comment highlighted in the paper that tells you where to find the discussion of the rule in the APA Style Manual.