APA (7th ed.) Citation

Walker G. (2003). Snowball earth: The story of the great global catastrophe that spawned life as we know it. Three rivers.

Chicago Style (17th ed.) Citation

Walker G. Snowball Earth: The Story of the Great Global Catastrophe That Spawned Life as We Know It. USA: Three rivers, 2003.

MLA (8th ed.) Citation

Walker G. Snowball Earth: The Story of the Great Global Catastrophe That Spawned Life as We Know It. Three rivers, 2003.