APA (7th ed.) Citation

Voskuil, W. H., & Sweeny, A. R. (1932). Illinois mineral industry in 1931: Preliminary statistical summary and economic review. State Geological Survey.

Chicago Style (17th ed.) Citation

Voskuil, Walter H., and Alma R. Sweeny. Illinois Mineral Industry in 1931: Preliminary Statistical Summary and Economic Review. Urbana, Ill.: State Geological Survey, 1932.

MLA (9th ed.) Citation

Voskuil, Walter H., and Alma R. Sweeny. Illinois Mineral Industry in 1931: Preliminary Statistical Summary and Economic Review. State Geological Survey, 1932.