University of Minnesota. Bureau of Institutional Research, ebrary, Inc, Eckert, R. E., & Keller, R. J. (1954). A university looks at its program: The report of the University of Minnesota Bureau of Institutional Research, 1942-1952. University of Minnesota Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)University of Minnesota. Bureau of Institutional Research, Inc ebrary, Ruth Elizabeth Eckert, و Robert J. Keller. A University Looks at Its Program: The Report of the University of Minnesota Bureau of Institutional Research, 1942-1952. Minneapolis: University of Minnesota Press, 1954.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)University of Minnesota. Bureau of Institutional Research, et al. A University Looks at Its Program: The Report of the University of Minnesota Bureau of Institutional Research, 1942-1952. University of Minnesota Press, 1954.