Não informado. (1970). Viewpoints. Indiana University, School of Education.
Chicago-Zitierstil (17. Ausg.)Não informado. Viewpoints. Bloomington, Ind: Indiana University, School of Education, 1970.
MLA-Zitierstil (8. Ausg.)Não informado. Viewpoints. Indiana University, School of Education, 1970.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.