"Reference source for psychologists, psychiatrists, social workers, counselors, sociologists, anthropologists, and other professionals who do research in human behavior." With approximately 2,150 entries (1,500 subjects; 650 persons), some twenty-four are on psychology throughout the world, as well as biographical entries of deceased and living contributors to psychology. Encyclopedia may be consulted for ready reference, summary, or textbook information. Entries give name or subject, dates, discussion, cross references, references, and name of author. Volume 4 consists of bibliography of 24,521 items, name index, and subject index.