Cita APA (7th ed.)

Clark, K. M. K. (1960). Looking at pictures. Holt.

Cita Chicago (17th ed.)

Clark, Kenneth Mc Kenzie. Looking at Pictures. New York: Holt, 1960.

Cita MLA (9th ed.)

Clark, Kenneth Mc Kenzie. Looking at Pictures. Holt, 1960.