Cita APA (7th ed.)

Cobb, J. C. (1989). Modern and Ancient Coal-Forming Environments. Geological Society of America.

Cita Chicago (17th ed.)

Cobb, James C. Modern and Ancient Coal-Forming Environments. Boulder, Colo: Geological Society of America, 1989.

Cita MLA (9th ed.)

Cobb, James C. Modern and Ancient Coal-Forming Environments. Geological Society of America, 1989.