APA (7th ed.) Citation

United States. Bureau of Mines. (1936). Report of investigations: Ventilation of manholes: 1. Effect of holes in the covers on natural ventilation. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Report of Investigations: Ventilation of Manholes: 1. Effect of Holes in the Covers on Natural Ventilation. [Washington]: [s.n.], 1936.

MLA (9th ed.) Citation

United States. Bureau of Mines. Report of Investigations: Ventilation of Manholes: 1. Effect of Holes in the Covers on Natural Ventilation. [s.n.], 1936.