APA (7th ed.) Citation

Cooper, C. L. (1946). Pennsylvanian ostracodes of Illinois. [publisher not identified].

Chicago Style (17th ed.) Citation

Cooper, Chalmer Lewis. Pennsylvanian Ostracodes of Illinois. Urbana, ill.: [publisher not identified], 1946.

MLA (9th ed.) Citation

Cooper, Chalmer Lewis. Pennsylvanian Ostracodes of Illinois. [publisher not identified], 1946.