Cita APA (7a ed.)

Heywood, C., & Cowey, A. (1996). Now you see it, now you don't. Colour vision.

Cita Chicago Style (17a ed.)

Heywood, C., y A. Cowey. Now You See It, Now You Don't. Colour Vision. 1996.

Cita MLA (9a ed.)

Heywood, C., y A. Cowey. Now You See It, Now You Don't. Colour Vision. 1996.