APA (7th ed.) Citation

Leighton, M. M. (1946). Operation of the Illinois State Geological Survey. [publisher not identified].

Chicago Style (17th ed.) Citation

Leighton, Morris M. Operation of the Illinois State Geological Survey. [Urbana, Ill.]: [publisher not identified], 1946.

MLA (9th ed.) Citation

Leighton, Morris M. Operation of the Illinois State Geological Survey. [publisher not identified], 1946.

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