Note: Text-color here is used only to highlight specific text elements. It is not part of APA format.
First, documenting source material means identifying the specific information you are borrowing: introduce it, providing the name of the source and a brief description of the source's authority. This introduction, or lead-in, is a transition that marks the beginning of the source information.
Second, use parentheses at the end of the source information to provide the number of the source page containing the information.
Physicists Glaser and von Hippel (2006, Feb.) argue that the longer the United States and its allies delay the conversion of their nuclear reactors from highly enriched uranium to low-enriched uranium, the more likely it is that terrorists will obtain highly enriched uranium to create nuclear weapons (p. 63).
After providing this information for all the sources in your paper, attach at the end of the paper an additional page titled References that lists in alphabetical order all the sources of your borrowed information. The References entries, together with the lead-in and parenthetic information you have provided in the paper itself, allow your reader to locate the original source.
Because the example source above was an article in Scientific American, a monthly periodical with individual page numbers, its entry on the References page looks like this:
Glaser, A. & von Hippel, F.N. (2006, Feb.). Thwarting nuclear terrorism. Scientific American, 56-63.
Note: Different kinds of sources require different References formats, and print sources are documented differently from web sources. Because formats are regularly updated to accommodate advances in technology, consult a current style guide or one of these online sites for specific information: