APA (7th ed.) Citation

Jeffers, C. W. (1930). Some hazards of conveyor loading in coal mines. [publisher not identified].

Chicago Style (17th ed.) Citation

Jeffers, C. W. Some Hazards of Conveyor Loading in Coal Mines. Washington, D.C.: [publisher not identified], 1930.

MLA (9th ed.) Citation

Jeffers, C. W. Some Hazards of Conveyor Loading in Coal Mines. [publisher not identified], 1930.