APA (7th ed.) Citation

Walker, G. (2003). Snowball Earth: The story of the great global catastrophe that spawned life as we know it. Crown Publishers.

Chicago Style (17th ed.) Citation

Walker, Gabrielle. Snowball Earth: The Story of the Great Global Catastrophe That Spawned Life as We Know It. New York: Crown Publishers, 2003.

MLA (9th ed.) Citation

Walker, Gabrielle. Snowball Earth: The Story of the Great Global Catastrophe That Spawned Life as We Know It. Crown Publishers, 2003.