APA (7th ed.) Citation

Crawford, F. S. (1931). Safety education at iron mines of Lake Superior region. [publisher not identified].

Chicago Style (17th ed.) Citation

Crawford, F. Stuart. Safety Education at Iron Mines of Lake Superior Region. Washington, D.C.: [publisher not identified], 1931.

MLA (9th ed.) Citation

Crawford, F. Stuart. Safety Education at Iron Mines of Lake Superior Region. [publisher not identified], 1931.