APA

Zangwill O. L., . (1950). An Introduction to Modern Psychology. New York: Philosophical Library.

Chicago

Zangwill O L, . 1950. An Introduction to Modern Psychology. New York: Philosophical Library.

Harvard

Zangwill O. L., . (1950). An Introduction to Modern Psychology. New York: Philosophical Library.

MLA

Zangwill O L, . An Introduction to Modern Psychology. New York: Philosophical Library. 1950.