Cita APA (7a ed.)

Sagan, C. (1977). The dragons of Eden: Speculations on the evolution of human intelligence. Ballantine Books.

Cita Chicago Style (17a ed.)

Sagan, Carl. The Dragons of Eden: Speculations on the Evolution of Human Intelligence. New York: Ballantine Books, 1977.

Cita MLA (8a ed.)

Sagan, Carl. The Dragons of Eden: Speculations on the Evolution of Human Intelligence. Ballantine Books, 1977.