APA (7th ed.) Citation

United States. Bureau of Mines. (1939). Installation of high-­tension power circuits in coal mine. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Installation of High-­tension Power Circuits in Coal Mine. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. Bureau of Mines. Installation of High-­tension Power Circuits in Coal Mine. [s.n.], 1939.