APA (7th ed.) Citation

Hjelmstad, K. E., Pomroy, W. H., & United States Department of the Interior. Bureau of Mines. (1991). Ultra low frequency electromagnetic fire alarm system for underground mines. Bureau of Mines, U.S. Dept. of the Interior.

Chicago Style (17th ed.) Citation

Hjelmstad, K. E., W. H. Pomroy, and United States Department of the Interior. Bureau of Mines. Ultra Low Frequency Electromagnetic Fire Alarm System for Underground Mines. [Washing, D.C.]: Bureau of Mines, U.S. Dept. of the Interior, 1991.

MLA (9th ed.) Citation

Hjelmstad, K. E., et al. Ultra Low Frequency Electromagnetic Fire Alarm System for Underground Mines. Bureau of Mines, U.S. Dept. of the Interior, 1991.