PsycINFO, from the American Psychological Association (APA), contains more than 2.4 million citations and summaries of journal articles, book chapters, books, and dissertations in psychology and related disciplines. It includes information about the psychological aspects of related fields such as medicine, psychiatry, nursing, sociology, education, pharmacology, physiology, linguistics, anthropology, business, law and others. Journal coverage spans 1887 to present, including international material from more than 2,200 periodicals in more than 27 languages. It is indexed with controlled vocabulary from APA's Thesaurus of Psychological Index Terms.