This article is the second in a series of three that reviews the citation patterns of references cited in the collection of the International Society for Performance Improvement literature (journal articles from 1962-2007 and chapters in all three human performance technology handbooks). An analysis of books and book chapters cited is included, as well as a list of what books and book chapters are cited most frequently. Part 3 will report on the most cited authors, by decade, overall, and by type of reference. (Contains 7 tables.) [For Part I, see EJ825031.]