Columba, M. (1926). A study of interests and their relations to other factors of achievement in the elementary school subjects. Catholic Education Press.
Chicago-referens (17:e uppl.)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.
MLA-referens (8:e uppl.)Columba, Mary. A Study of Interests and Their Relations to Other Factors of Achievement in the Elementary School Subjects. Catholic Education Press, 1926.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.