APA PsycBooks This link opens in a new windowFrom the American Psychological Association (APA), includes chapters in PDF from books published by the APA and other distinguished publishers, and includes digitized content of historical significance from the Archives of the History of American Psychology (AHAP) collection. It also contains classic books of landmark historical impact in psychology dating from the 1600s, and the exclusive electronic release of authored entries from APA/Oxford University Press Encyclopedia of Psychology. Also contains many of the APA handbooks.