APA (7th ed.) Citation

Bretz, J. H. (1939). Geology of the Chicago region. [publisher not identified].

Chicago Style (17th ed.) Citation

Bretz, J. Harlen. Geology of the Chicago Region. Urbana, Ill.: [publisher not identified], 1939.

MLA (9th ed.) Citation

Bretz, J. Harlen. Geology of the Chicago Region. [publisher not identified], 1939.

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