APA (7th ed.) Citation

Asimov, I., & Wool, D. (1981). How did we find out about volcanoes? Walker.

Chicago Style (17th ed.) Citation

Asimov, Isaac, and David Wool. How Did We Find Out About Volcanoes? New York: Walker, 1981.

MLA (9th ed.) Citation

Asimov, Isaac, and David Wool. How Did We Find Out About Volcanoes? Walker, 1981.