Columba, M. (1926). A study of interests and their relations to other factors of achievement in the elementary school subjects. Catholic Education Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Columba, Mary. A Study of Interests and Their Relations to Other Factors of Achievement in the Elementary School Subjects. Washington, D.C.: Catholic Education Press, 1926.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Columba, Mary. A Study of Interests and Their Relations to Other Factors of Achievement in the Elementary School Subjects. Catholic Education Press, 1926.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.