Henry, N. B. (1957). In-service education for teachers, supervisors, and administrators. Chicago Press.
Lua i Stíl Chicago (17ú heag.)Henry, Nelson B. In-service Education for Teachers, Supervisors, and Administrators. Illinois: Chicago Press, 1957.
Lua MLA (9ú heag.)Henry, Nelson B. In-service Education for Teachers, Supervisors, and Administrators. Chicago Press, 1957.
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