---Attribution---
Always provide the source of ideas you include in your work. Be sure to distinguish your ideas from those based on other sources. Whenever you are using the ideas or arguments of others, be sure to provide a citation for the source of those ideas. You should be able to paraphrase a point, idea, or finding without relying on direct quotation, but you must indicate the source. That is, you must provide a citation (author, year).
If it is necessary to use the words of others, even a few words, be sure to place the words in quotation marks and to provide a citation and page number.
Read VCs documents about attribution: Originality and Attribution
Here is a link showing you how to use APA style for direct quotations:
http://nutsandbolts.washcoll.edu/apa.html#quotations
If you did not read a source and you are using information about that source based on another source, you are relying on a secondary source. I dont recommend this practice, but on rare occasions it is necessary. Make it clear that you did not read the original source. Do this by using the phrase as cited in. This link tells you how to go about it: http://library.uww.edu/GUIDES/APACITE.htm#secondary
This page provides many of the necessary APA formats for references: http://library.uww.edu/guides/apacite.htm
Look here for loads of tips on APA style: http://nutsandbolts.washcoll.edu/apa.html