Even if you find my APA tips helpful, you need to purchase your own copy of the Publication Manual if you plan to get a degree in nursing. Here's the reference information, done in APA style (without the hanging indent or double spacing, because that doesn't work in this format):

American Psychological Association. (2001). Publication manual of the American Psychological Association (5th ed.). Washington, DC: Author.

You can order it from www.amazon.com, www.barnesandnoble.com, or at http://www.apa.org/Books/4200060.html, among other places. You can also get "help with APA style guidelines" at www.apastyle.org.