APA Citation

Kummel, B. (1961). History of the earth: An introduction to historical geology. WH Freeman.

Chicago Style Citation

Kummel, Bernhard. History of the Earth: An Introduction to Historical Geology. WH Freeman, 1961.

MLA Citation

Kummel, Bernhard. History of the Earth: An Introduction to Historical Geology. WH Freeman, 1961.

Warning: These citations may not always be 100% accurate.