Potter, P. E., & Desborough, G. A. (1965). Pre-Pennsylvanian Evansville Valley and Caseyville (Pennsylvanian) sedimentation in the Illinois Basin. [publisher not identified].
Chicago Style (17th ed.) CitationPotter, Paul Edwin, and George A. Desborough. Pre-Pennsylvanian Evansville Valley and Caseyville (Pennsylvanian) Sedimentation in the Illinois Basin. Urbana: [publisher not identified], 1965.
MLA (9th ed.) CitationPotter, Paul Edwin, and George A. Desborough. Pre-Pennsylvanian Evansville Valley and Caseyville (Pennsylvanian) Sedimentation in the Illinois Basin. [publisher not identified], 1965.
Warning: These citations may not always be 100% accurate.