Não informado. (1939). Supervision: The magazine of industrial relations and operating management. National Association of Foremen.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Supervision: The Magazine of Industrial Relations and Operating Management. Burlington, Vt: National Association of Foremen, 1939.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Supervision: The Magazine of Industrial Relations and Operating Management. National Association of Foremen, 1939.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.