APA (7th ed.) Citation

Ellis, W. D. (1967). A source book of Gestalt psychology. Humanities Press.

Chicago Style (17th ed.) Citation

Ellis, Willis Davis. A Source Book of Gestalt Psychology. New York: Humanities Press, 1967.

MLA (9th ed.) Citation

Ellis, Willis Davis. A Source Book of Gestalt Psychology. Humanities Press, 1967.