APA (7th ed.) Citation

Geological Society of America. Coal Geology Division, Dapples, E. C., & Hopkins, M. E. (1969). Environments of coal deposition. Geological Society of America.

Chicago Style (17th ed.) Citation

Geological Society of America. Coal Geology Division, Edward C. Dapples, and M. E. Hopkins. Environments of Coal Deposition. Boulder, Colo.: Geological Society of America, 1969.

MLA (9th ed.) Citation

Geological Society of America. Coal Geology Division, et al. Environments of Coal Deposition. Geological Society of America, 1969.