APA (7th ed.) Citation

United States. Bureau of Mines. (1939). Investigation of electrical equipment, safety lamps, and gas detectors for safety. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Investigation of Electrical Equipment, Safety Lamps, and Gas Detectors for Safety. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. Bureau of Mines. Investigation of Electrical Equipment, Safety Lamps, and Gas Detectors for Safety. [s.n.], 1939.

Warning: These citations may not always be 100% accurate.