APA (7th ed.) Citation

Nighman, C. E., & Kiessling, O. E. (1940). Rock drilling. Work Projects Administration, National Research Project : Department of the Interior, Bureau of Mines.

Chicago Style (17th ed.) Citation

Nighman, C. E., and O. E. Kiessling. Rock Drilling. Philadelphia, Pennsylvania: Work Projects Administration, National Research Project : Department of the Interior, Bureau of Mines, 1940.

MLA (9th ed.) Citation

Nighman, C. E., and O. E. Kiessling. Rock Drilling. Work Projects Administration, National Research Project : Department of the Interior, Bureau of Mines, 1940.