APA (7th ed.) Citation

Halliday, W. R. (1976). Depths of the earth: Caves and cavers of the United States (Rev. and enl. ed.). Harper & Row.

Chicago Style (17th ed.) Citation

Halliday, William R. Depths of the Earth: Caves and Cavers of the United States. Rev. and enl. ed. New York: Harper & Row, 1976.

MLA (9th ed.) Citation

Halliday, William R. Depths of the Earth: Caves and Cavers of the United States. Rev. and enl. ed. Harper & Row, 1976.