APA (7th ed.) Citation

Busch, W. L. (1967). Directory of Illinois sand and gravel producers. Illinois State Geological Survey.

Chicago Style (17th ed.) Citation

Busch, Willis L. Directory of Illinois Sand and Gravel Producers. Urbana: Illinois State Geological Survey, 1967.

MLA (9th ed.) Citation

Busch, Willis L. Directory of Illinois Sand and Gravel Producers. Illinois State Geological Survey, 1967.

Warning: These citations may not always be 100% accurate.