Παραπομπή APA

Munn, R. F. (1977). The coal industry in America: A bibliography and guide to studies (2nd. edition.). Virginia: West Virginia Univercity Library.

Παραπομπή Chicago Style

Munn, Robert F. The Coal Industry in America: A Bibliography and Guide to Studies. 2nd. edition. Virginia: West Virginia Univercity Library, 1977.

Παραπομπή MLA

Munn, Robert F. The Coal Industry in America: A Bibliography and Guide to Studies. 2nd. edition. Virginia: West Virginia Univercity Library, 1977.

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