APA
Hartmann G. W., . (1935). Gestalt psychology. New York: The Ronald Press Company.
Chicago
Hartmann George W, . 1935. Gestalt psychology. New York: The Ronald Press Company.
Harvard
Hartmann G. W., . (1935). Gestalt psychology. New York: The Ronald Press Company.
MLA
Hartmann George W, . Gestalt psychology. New York: The Ronald Press Company. 1935.
