APA (7th ed.) Citation

Gleim, E. J. (1932). Guarding trolley wires in mines. [publisher not identified].

Chicago Style (17th ed.) Citation

Gleim, E. J. Guarding Trolley Wires in Mines. Washington, D.C.: [publisher not identified], 1932.

MLA (9th ed.) Citation

Gleim, E. J. Guarding Trolley Wires in Mines. [publisher not identified], 1932.