APA (7th ed.) Citation

Jackson, C. F., & Knaebel, J. B. (1932). Small-scale placer-mining methods. [publisher not identified].

Chicago Style (17th ed.) Citation

Jackson, Charles F., and John Ballantine Knaebel. Small-scale Placer-mining Methods. Washington, D.C.: [publisher not identified], 1932.

MLA (9th ed.) Citation

Jackson, Charles F., and John Ballantine Knaebel. Small-scale Placer-mining Methods. [publisher not identified], 1932.