Diederichs, R. E. (1979). College dropouts, a demographic survey: A study of demographic characteristics of student dropbuts from two urban institutions of higher education. Saint Louis University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Diederichs, Ronald Erwin. College Dropouts, a Demographic Survey: A Study of Demographic Characteristics of Student Dropbuts from Two Urban Institutions of Higher Education. St. Louis: Saint Louis University, 1979.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Diederichs, Ronald Erwin. College Dropouts, a Demographic Survey: A Study of Demographic Characteristics of Student Dropbuts from Two Urban Institutions of Higher Education. Saint Louis University, 1979.
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