Beckmann, M. (1955). Studies in the economics of transportation. Published for the Cowles Commission for Research in Economics by Yale University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Beckmann, Martin. Studies in the Economics of Transportation. New Haven: Published for the Cowles Commission for Research in Economics by Yale University Press, 1955.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Beckmann, Martin. Studies in the Economics of Transportation. Published for the Cowles Commission for Research in Economics by Yale University Press, 1955.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.