APA (7th ed.) Citation

Piskin, K., & Bergstrom, R. E. (1975). Glacial drift in Illinois: Thickness and character. Illinois State Geological Survey.

Chicago Style (17th ed.) Citation

Piskin, Kemal, and Robert E. Bergstrom. Glacial Drift in Illinois: Thickness and Character. Urbana, IL: Illinois State Geological Survey, 1975.

MLA (9th ed.) Citation

Piskin, Kemal, and Robert E. Bergstrom. Glacial Drift in Illinois: Thickness and Character. Illinois State Geological Survey, 1975.

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