Citazione Stile APA (7a Edizione)

Gordon, R. L. (1987). World coal: Economics, policies, and prospects. Cambridge University Press.

Citazione stile Chigago Style (17a edizione)

Gordon, Richard L. World Coal: Economics, Policies, and Prospects. Cambridge [Cambridgeshire]: Cambridge University Press, 1987.

Citatione MLA (9a ed.)

Gordon, Richard L. World Coal: Economics, Policies, and Prospects. Cambridge University Press, 1987.