APA (7th ed.) Citation

Grim, R. E. (1941). Petrographic and ceramic properties of Pennsylvanian shales of Illinois. [publisher not identified].

Chicago Style (17th ed.) Citation

Grim, Ralph E. Petrographic and Ceramic Properties of Pennsylvanian Shales of Illinois. Urbana, Illinois: [publisher not identified], 1941.

MLA (9th ed.) Citation

Grim, Ralph E. Petrographic and Ceramic Properties of Pennsylvanian Shales of Illinois. [publisher not identified], 1941.