APA (7e ed.) Bronvermelding

Walker, E. L. (1970). Psychology as a natural and social science. Brooks/Cole Publishing Company.

Chicago (17e ed.) Bronvermelding

Walker, Edward L. Psychology as a Natural and Social Science. Belmont, California: Brooks/Cole Publishing Company, 1970.

MLA (9e ed.) Bronvermelding

Walker, Edward L. Psychology as a Natural and Social Science. Brooks/Cole Publishing Company, 1970.