Não informado. (1970). American secondary education. Ohio Association of Secondary School Administrators.
Lua i Stíl Chicago (17ú heag.)Não informado. American Secondary Education. Akron, Ohio: Ohio Association of Secondary School Administrators, 1970.
Lua MLA (8ú heag.)Não informado. American Secondary Education. Ohio Association of Secondary School Administrators, 1970.
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