APA (7th ed.) Zitazioa

Fry, C. (1955). Venus observada. Sudamericana.

Chicago Style (17th ed.) Zitazioa

Fry, Christopher. Venus Observada. Buenos Aires: Sudamericana, 1955.

MLA (9th ed.) Zitazioa

Fry, Christopher. Venus Observada. Sudamericana, 1955.