Pytel, W. M., & Chugh, Y. P. (1990). An Analysis of roof-pillar-weak floor interaction in partial extraction room-and-pillar mining. Illinois Mine Subsidence Research Program, Illinois State Geological Survey.
Chicago Style (17th ed.) CitationPytel, W. M., and Yoginder P. Chugh. An Analysis of Roof-pillar-weak Floor Interaction in Partial Extraction Room-and-pillar Mining. Champaign, Ill.: Illinois Mine Subsidence Research Program, Illinois State Geological Survey, 1990.
MLA (9th ed.) CitationPytel, W. M., and Yoginder P. Chugh. An Analysis of Roof-pillar-weak Floor Interaction in Partial Extraction Room-and-pillar Mining. Illinois Mine Subsidence Research Program, Illinois State Geological Survey, 1990.
Warning: These citations may not always be 100% accurate.