APA-referens (7:e uppl.)

Greene, H. (1889). Coal and the coal mines. Houghton, Mifflin and Company.

Chicago-referens (17:e uppl.)

Greene, Homer. Coal and the Coal Mines. Boston, New York: Houghton, Mifflin and Company, 1889.

MLA-referens (8:e uppl.)

Greene, Homer. Coal and the Coal Mines. Houghton, Mifflin and Company, 1889.