Não informado. (1939). Supervision: The magazine of industrial relations and operating management. National Association of Foremen.
Chicago-Zitierstil (17. Ausg.)Não informado. Supervision: The Magazine of Industrial Relations and Operating Management. Burlington, Vt: National Association of Foremen, 1939.
MLA-Zitierstil (8. Ausg.)Não informado. Supervision: The Magazine of Industrial Relations and Operating Management. National Association of Foremen, 1939.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.