APA (7th ed.) Citation

McElroy, G. E. (1932). Economic size of metal-mine airways. [publisher not identified].

Chicago Style (17th ed.) Citation

McElroy, G. E. Economic Size of Metal-mine Airways. Washington, D.C.: [publisher not identified], 1932.

MLA (9th ed.) Citation

McElroy, G. E. Economic Size of Metal-mine Airways. [publisher not identified], 1932.