Não informado. (1938). Occupational Hazards. Penton Publishing.
Style de citation Chicago (17e éd.)Não informado. Occupational Hazards. Cleveland, Ohio: Penton Publishing, 1938.
Style de citation MLA (8e éd.)Não informado. Occupational Hazards. Penton Publishing, 1938.
Attention : ces citations peuvent ne pas être correctes à 100%.