The following are mostly made up examples. The definitive resource for this information is APA's latest Publication Manual, which in available at Langson Library Reference (currently on reserve under call number BF76.7 .P83 2010 at the loan desk).
Journal reference in a reference list
Rosenvinge, J.-H., Skårderud, F., & Thune-Larsen, K. (2003). Can educational programmes raise clinical competence in treating eating disorders? Results from a Norwegian trial. European Eating Disorders Review, 11, 329-343. doi:10.1002/erv.503
Notes: The above should be a hanging indent and double spaced. J.-H. is a hyphenated first name. The issue number is not present because this journal title is continuously paginated. The doi or digitial object identifier indicates retrieval from an online resource. Doi numbers are available in PsycINFO and/or on the article itself. If there is no doi and the article was read in a pdf document, I recommend citing it as a print reference. This is not in strict accordance with APA's Publication Manual, but the difficulty of finding a doi or of finding a publisher website makes this advisable. Can't find a doi? Locate an available doi here!
Journal reference in text
(Rosenvinge, Skårderud & Thune-Larsen, 2003) for the first time the reference is cited. Afterwards, use (Rosenvinge et al., 2003). If citing the same article in the same paragraph, use only Resenvinge et al without the year.
Notes: Cite up to five authors for the first time referenced in text. If there are six or more authors, use the first author's last name followed by et al and continue to do so throughout the text. Within the text of a paper, you may either use the author's name followed by a comma with the date of the publication, or you may use the author's name outside the comma with the date in parenthesis immediately following the author's name.
(Smith & Jones, 2009) OR Smith and Jones (2009)
Notes: Use "and" when you use the authors names in a sentence and "&" when you place it in parenthesis.
Book chapter in a reference list
Vugt, M. van & Park, J. H. (2010). The tribal instinct hypothesis : evolution and the social psychology of intergroup relations. In Stürmer, S & Mark Snyder (Eds.), The psychology of prosocial behavior: Group processes, intergroup relations, and helping (pp. 6-20). Malden, MA: Wiley-Blackwell.
Notes: The above should be a hanging indent and double spaced. Remember that author names are capitalized according to the country of origin (see the biographical section of Merriam-Webster's Collegiate Dictionary in Langson Library Reference at PE1628 .M36 2003).
Book chapter in text
(Vugt & Park, 2010)
Notes: If you are quoting or refering to a single page, the in text citation might be (Vugt & Park, 2010, p. 7). If citing a particular chapter, (Vugt & Park, 2010, chap. 2). If citing a set of pages, use (Vugt & Park, 2010, pp. 7-10).