This online 4 volumes encyclopedia covers major psychological theories and development issues. Great for information on Piaget and Erikson.

In-depth coverage of major psychological theories and the people who developed them.

This second edition, published in 2007, covers the latest research on the study of aging. Influences range from genetics to physiology, sociology, psychology, and anthropology. Physical, social, and economic environments as well as the traditions of families and religion also influence human life.

This 3rd edition, published in 2009, explores the social, medical, legal and political issues related to drugs and alcohol and associated behaviors. Includes emerging topics and developments in the many fields of addiction studies.

Online version of the original 5 volume set published in 2007. Provides comprehensive overviews of social conditions and reform movements in the United States.

Provides information on the cultures of the world, covering different areas of daily life including clothing, food, language and religion.