APA (7th ed.) Citation

Papp, A. R., Hower, J. C., & Peters, D. C. Atlas of coal geology. AAPG.

Chicago Style (17th ed.) Citation

Papp, Alexander R., James C. Hower, and Douglas C. Peters. Atlas of Coal Geology. [S.l.]: AAPG.

MLA (8th ed.) Citation

Papp, Alexander R., et al. Atlas of Coal Geology. AAPG.

Warning: These citations may not always be 100% accurate.