APA (7th ed.) Citation

Halliday, W. R. (1966). Depths of the earth: Caves and cavers of the United States ([1st ed.].). Harper & Row.

Chicago Style (17th ed.) Citation

Halliday, William R. Depths of the Earth: Caves and Cavers of the United States. [1st ed.]. New York: Harper & Row, 1966.

MLA (8th ed.) Citation

Halliday, William R. Depths of the Earth: Caves and Cavers of the United States. [1st ed.]. Harper & Row, 1966.