APA (7th ed.) Citation

Hartmann, G. W. (1935). Gestalt psychology: A survey of facts and principles. The Ronald press company.

Chicago Style (17th ed.) Citation

Hartmann, George W. Gestalt Psychology: A Survey of Facts and Principles. New York: The Ronald press company, 1935.

MLA (9th ed.) Citation

Hartmann, George W. Gestalt Psychology: A Survey of Facts and Principles. The Ronald press company, 1935.