Cita APA (7a ed.)

Willows, D. M., & Houghton, H. A. (1987). The psychology of illustration. Springer.

Cita Chicago Style (17a ed.)

Willows, Dale M., y Harvey A. Houghton. The Psychology of Illustration. New York [etc.]: Springer, 1987.

Cita MLA (9a ed.)

Willows, Dale M., y Harvey A. Houghton. The Psychology of Illustration. Springer, 1987.