Annotated Bibliography Examples: (Best content guide for this assignment)
http://library.csumb.edu/instruction/classes/Day15Lab.php#article
How to write annotated bibliographies: (Additional guidelines)
http://www.mun.ca/library/research_help/qeii/annotated_bibl.html
A research guide for students: (Additional material, although not APA)
http://www.aresearchguide.com/11guide.html

Here's a site a learner just found.

http://www.lesley.edu/library/guides/citation/apa_annotated.html