Não informado. (1939). Supervision: The magazine of industrial relations and operating management. National Association of Foremen.
Citação do estilo Chicago (17ª ed.)Não informado. Supervision: The Magazine of Industrial Relations and Operating Management. Burlington, Vt: National Association of Foremen, 1939.
Citação MLA (8ª ed.)Não informado. Supervision: The Magazine of Industrial Relations and Operating Management. National Association of Foremen, 1939.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.