APA (7th ed.) Citation

Dunbar, C. O., Henbest, L. G., & Weller, J. M. (1942). Pennsylvanian fusulinidae of Illinois. State Geological Survey.

Chicago Style (17th ed.) Citation

Dunbar, Carl O., Lloyd G. Henbest, and J. Marvin Weller. Pennsylvanian Fusulinidae of Illinois. Urbana: State Geological Survey, 1942.

MLA (9th ed.) Citation

Dunbar, Carl O., et al. Pennsylvanian Fusulinidae of Illinois. State Geological Survey, 1942.