APA (7th ed.) Citation

Paul, J. W. (1930). What superintendent of coal mine might do to prevent injury from falls of roof. [publisher not identified].

Chicago Style (17th ed.) Citation

Paul, J. W. What Superintendent of Coal Mine Might Do to Prevent Injury from Falls of Roof. Washington, D.C.: [publisher not identified], 1930.

MLA (9th ed.) Citation

Paul, J. W. What Superintendent of Coal Mine Might Do to Prevent Injury from Falls of Roof. [publisher not identified], 1930.