APA (7th ed.) Citation

Knovel (Firm), Whateley, M. K. G., & Spears, D. A. (1995). European coal geology. Geological Society.

Chicago Style (17th ed.) Citation

Knovel (Firm), M. K. G. Whateley, and D. A. Spears. European Coal Geology. London: Geological Society, 1995.

MLA (9th ed.) Citation

Knovel (Firm), et al. European Coal Geology. Geological Society, 1995.