APA (7th ed.) Citation

Babcock, C. O. (1978). A flexible helical rock bolt ([Rev. ed.].). Dept. of the Interior, Bureau of Mines.

Chicago Style (17th ed.) Citation

Babcock, Clarence O. A Flexible Helical Rock Bolt. [Rev. ed.]. [Washington]: Dept. of the Interior, Bureau of Mines, 1978.

MLA (9th ed.) Citation

Babcock, Clarence O. A Flexible Helical Rock Bolt. [Rev. ed.]. Dept. of the Interior, Bureau of Mines, 1978.