Cita APA (7a ed.)

Post, R. C., & Donovan, A. (1980). Every four yedars (1st. ed.). Smithsonian Exposition Books.

Cita Chicago Style (17a ed.)

Post, Robert C., y Amy Donovan. Every Four Yedars. 1st. ed. [Washington]: Smithsonian Exposition Books, 1980.

Cita MLA (9a ed.)

Post, Robert C., y Amy Donovan. Every Four Yedars. 1st. ed. Smithsonian Exposition Books, 1980.