Jackman, H. W., Jackman, H. W., Helfinstine, R. J., & Helfinstine, R. J. (1968). Drying and preheating coals before coking. Illinois State Geological Survey.
Chicago Style (17th ed.) CitationJackman, Harold W., Harold W. Jackman, Roy John Helfinstine, and Roy John Helfinstine. Drying and Preheating Coals Before Coking. Urbana, Ill: Illinois State Geological Survey, 1968.
MLA (9th ed.) CitationJackman, Harold W., et al. Drying and Preheating Coals Before Coking. Illinois State Geological Survey, 1968.
Warning: These citations may not always be 100% accurate.