Não informado. (1939). Supervision: The magazine of industrial relations and operating management. National Association of Foremen.
Lua i Stíl Chicago (17ú heag.)Não informado. Supervision: The Magazine of Industrial Relations and Operating Management. Burlington, Vt: National Association of Foremen, 1939.
Lua MLA (8ú heag.)Não informado. Supervision: The Magazine of Industrial Relations and Operating Management. National Association of Foremen, 1939.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.