APA (7th ed.) Citation

Colony Coal Co & Bryson, W. D. (1932). Mechanically driven level rock tunnel. [publisher not identified].

Chicago Style (17th ed.) Citation

Colony Coal Co and W. D. Bryson. Mechanically Driven Level Rock Tunnel. Washington, D.C.: [publisher not identified], 1932.

MLA (9th ed.) Citation

Colony Coal Co and W. D. Bryson. Mechanically Driven Level Rock Tunnel. [publisher not identified], 1932.