Cita APA (7th ed.)

Fenton, C. L. (1953). Prehistoric World: Stories of animal life in part ages. The John Day Company.

Cita Chicago (17th ed.)

Fenton, Carroll Lane. Prehistoric World: Stories of Animal Life in Part Ages. Nueva York: The John Day Company, 1953.

Cita MLA (9th ed.)

Fenton, Carroll Lane. Prehistoric World: Stories of Animal Life in Part Ages. The John Day Company, 1953.