Não informado. (1968). Contemporary education. Indiana University, School of Education.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Contemporary Education. Terre Haute, Ind: Indiana University, School of Education, 1968.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Contemporary Education. Indiana University, School of Education, 1968.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.