Não informado. (1970). American secondary education. Ohio Association of Secondary School Administrators.
Chicago-Zitierstil (17. Ausg.)Não informado. American Secondary Education. Akron, Ohio: Ohio Association of Secondary School Administrators, 1970.
MLA-Zitierstil (8. Ausg.)Não informado. American Secondary Education. Ohio Association of Secondary School Administrators, 1970.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.