APA (7th ed.) Citation

Voskuil, W. H. (1949). Illinois mineral industry in 1947. State Geological Survey.

Chicago Style (17th ed.) Citation

Voskuil, Walter H. Illinois Mineral Industry in 1947. Urbana, Ill.: State Geological Survey, 1949.

MLA (9th ed.) Citation

Voskuil, Walter H. Illinois Mineral Industry in 1947. State Geological Survey, 1949.