(1968). Research methods in librarianship: Measurement and evaluation. University of Illinois Graduate School of Library Science.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Research Methods in Librarianship: Measurement and Evaluation. Urbana: University of Illinois Graduate School of Library Science, 1968.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Research Methods in Librarianship: Measurement and Evaluation. University of Illinois Graduate School of Library Science, 1968.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.