APA (7th ed.) Citation

Hackett, J. E., & Bergstrom, R. E. (1956). Groundwater in northwestern Illinois.

Chicago Style (17th ed.) Citation

Hackett, James E., and Robert E. Bergstrom. Groundwater in Northwestern Illinois. Urbana, Ill, 1956.

MLA (9th ed.) Citation

Hackett, James E., and Robert E. Bergstrom. Groundwater in Northwestern Illinois. 1956.

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