APA (7th ed.) Citation

Stevenson, D. L., Keys, J. N., & Cluff, R. M. (1980). Catalog of Devonian and deeper tests in central Illinois. Illinois State Geological Survey.

Chicago Style (17th ed.) Citation

Stevenson, D. L., John N. Keys, and Robert M. Cluff. Catalog of Devonian and Deeper Tests in Central Illinois. Urbana: Illinois State Geological Survey, 1980.

MLA (9th ed.) Citation

Stevenson, D. L., et al. Catalog of Devonian and Deeper Tests in Central Illinois. Illinois State Geological Survey, 1980.