APA (7th ed.) Citation

Lamar, J. E. (1948). Clay and shale resources of extreme southern Illinois. [publisher not identified].

Chicago Style (17th ed.) Citation

Lamar, J. E. Clay and Shale Resources of Extreme Southern Illinois. Urbana: [publisher not identified], 1948.

MLA (9th ed.) Citation

Lamar, J. E. Clay and Shale Resources of Extreme Southern Illinois. [publisher not identified], 1948.