Não informado. (1967). Perspectives on Education. Columbia University, Teachers College.
Chicago-Zitierstil (17. Ausg.)Não informado. Perspectives on Education. New York: Columbia University, Teachers College, 1967.
MLA-Zitierstil (8. Ausg.)Não informado. Perspectives on Education. Columbia University, Teachers College, 1967.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.