APA Symbols BASIC BIBLIOGRAPHIC INFORMATION APA American Psychological Association The American Psychological Association was founded in 1892 with 31 members and grew quickly after World War II. Today, APA is the largest scientific and professional organization representing psychology in the United States, with more than 121,000 researchers, educators, clinicians, consultants and students as its members. APA also has 54 divisions in subfields of psychology. Cite and Refer To cite a piece of work is to provide a reference to its source