APA (7th ed.) Citation

Sagan, D. (1990). Biosfera: Metamorfosis del planeta tierra. Alianza.

Chicago Style (17th ed.) Citation

Sagan, Dorian. Biosfera: Metamorfosis Del Planeta Tierra. Madrid: Alianza, 1990.

MLA (9th ed.) Citation

Sagan, Dorian. Biosfera: Metamorfosis Del Planeta Tierra. Alianza, 1990.

Warning: These citations may not always be 100% accurate.