Não informado. (1970). Viewpoints. Indiana University, School of Education.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Viewpoints. Bloomington, Ind: Indiana University, School of Education, 1970.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Viewpoints. Indiana University, School of Education, 1970.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.