Não informado. (1939). Supervision: The magazine of industrial relations and operating management. National Association of Foremen.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Supervision: The Magazine of Industrial Relations and Operating Management. Burlington, Vt: National Association of Foremen, 1939.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Supervision: The Magazine of Industrial Relations and Operating Management. National Association of Foremen, 1939.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.