APA (7th ed.) Citation

Shurr, G. W. (1976). Marine cycles in the lower Montana group, Montana and South Dakota. [publisher not identified].

Chicago Style (17th ed.) Citation

Shurr, George W. Marine Cycles in the Lower Montana Group, Montana and South Dakota. [Place of publication not identified]: [publisher not identified], 1976.

MLA (9th ed.) Citation

Shurr, George W. Marine Cycles in the Lower Montana Group, Montana and South Dakota. [publisher not identified], 1976.