Παραπομπή APA

Papp, A. R., Hower, J. C., Peters, D. C., & Rogers, M. A. (1977). Atlas of coal geology. [s. l.]: American Association of Petroleum Geologists.

Παραπομπή Chicago Style

Papp, Alexander R., James C. Hower, Douglas C. Peters, and Margaret Anne Rogers. Atlas of Coal Geology. [s. l.]: American Association of Petroleum Geologists, 1977.

Παραπομπή MLA

Papp, Alexander R., James C. Hower, Douglas C. Peters, and Margaret Anne Rogers. Atlas of Coal Geology. [s. l.]: American Association of Petroleum Geologists, 1977.

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