APA (7th ed.) Citation

Collinson, C. W., & Skartvedt, R. (1960). Pennsylvanian plant fossils of Illinois: Field book. Illinois State, Geological Survey.

Chicago Style (17th ed.) Citation

Collinson, Charles William, and Romayne Skartvedt. Pennsylvanian Plant Fossils of Illinois: Field Book. Urbana, Ill: Illinois State, Geological Survey, 1960.

MLA (9th ed.) Citation

Collinson, Charles William, and Romayne Skartvedt. Pennsylvanian Plant Fossils of Illinois: Field Book. Illinois State, Geological Survey, 1960.