Não informado. (1939). Supervision: The magazine of industrial relations and operating management. National Association of Foremen.
Chicago-referens (17:e uppl.)Não informado. Supervision: The Magazine of Industrial Relations and Operating Management. Burlington, Vt: National Association of Foremen, 1939.
MLA-referens (8:e uppl.)Não informado. Supervision: The Magazine of Industrial Relations and Operating Management. National Association of Foremen, 1939.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.