Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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