Cita APA (7a ed.)

Helmholtz, H. v., Warren, R. M., & Warren, R. P. (1968). Helmholtz on perception: Its physiology and development. John Wiley & Sons, Inc.

Cita Chicago Style (17a ed.)

Helmholtz, Hermann von, Richard M. Warren, y Roslyn P. Warren. Helmholtz on Perception: Its Physiology and Development. New York ; London ; Sydney: John Wiley & Sons, Inc, 1968.

Cita MLA (9a ed.)

Helmholtz, Hermann von, et al. Helmholtz on Perception: Its Physiology and Development. John Wiley & Sons, Inc, 1968.