APA (7th ed.) Citation

Sagan, D. (1990). Biospheres: Metamorphosis of planet Earth. McGraw-Hill.

Chicago Style (17th ed.) Citation

Sagan, Dorion. Biospheres: Metamorphosis of Planet Earth. New York: McGraw-Hill, 1990.

MLA (9th ed.) Citation

Sagan, Dorion. Biospheres: Metamorphosis of Planet Earth. McGraw-Hill, 1990.