Greene, H. (1889). Coal and the coal mines. Houghton, Mifflin and Company.
Lua i Stíl Chicago (17ú heag.)Greene, Homer. Coal and the Coal Mines. Boston, New York: Houghton, Mifflin and Company, 1889.
Lua MLA (8ú heag.)Greene, Homer. Coal and the Coal Mines. Houghton, Mifflin and Company, 1889.
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