Não informado. (1967). Perspectives on Education. Columbia University, Teachers College.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Perspectives on Education. New York: Columbia University, Teachers College, 1967.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Perspectives on Education. Columbia University, Teachers College, 1967.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.