Smith, A. (1966). Redundancy practices in four industries: A comparison od structural redundancy practice in the railway, steel cotton textiles and telecommunications industries of the United States and the United Kingdom. O.E.C.D.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Smith, A.D. Redundancy Practices in Four Industries: A Comparison Od Structural Redundancy Practice in the Railway, Steel Cotton Textiles and Telecommunications Industries of the United States and the United Kingdom. [Paris]: O.E.C.D, 1966.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Smith, A.D. Redundancy Practices in Four Industries: A Comparison Od Structural Redundancy Practice in the Railway, Steel Cotton Textiles and Telecommunications Industries of the United States and the United Kingdom. O.E.C.D, 1966.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.