Não informado. (1968). Contemporary education. Indiana University, School of Education.
Chicago-referens (17:e uppl.)Não informado. Contemporary Education. Terre Haute, Ind: Indiana University, School of Education, 1968.
MLA-referens (8:e uppl.)Não informado. Contemporary Education. Indiana University, School of Education, 1968.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.