APA (7th ed.) Citation

Paul, J. W., & Plein, L. N. (1932). Study of mine roof of Pittsburgh coal bed in Pittsburgh mining district. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Paul, J. W., and Leopold Nicholas Plein. Study of Mine Roof of Pittsburgh Coal Bed in Pittsburgh Mining District. [Washington?]: U.S. Government Printing Office, 1932.

MLA (9th ed.) Citation

Paul, J. W., and Leopold Nicholas Plein. Study of Mine Roof of Pittsburgh Coal Bed in Pittsburgh Mining District. U.S. Government Printing Office, 1932.