APA (7th ed.) Citation

Sayers, R. R. (1932). Physiological factors in mine ventilation in 1931. [s.n.].

Chicago Style (17th ed.) Citation

Sayers, R. R. Physiological Factors in Mine Ventilation in 1931. Washington, D.C.: [s.n.], 1932.

MLA (8th ed.) Citation

Sayers, R. R. Physiological Factors in Mine Ventilation in 1931. [s.n.], 1932.