National Association of Secondary School Principals. (1972). NASSP bulletin. NASSP Bulletin (formerly: Yearbook of the National Association of Secondary School Principals; Bulletin of the Department of Secondary-School Principals of the National Education Association).
Chicago-tyylinen lähdeviittausNational Association of Secondary School Principals. "NASSP Bulletin." NASSP Bulletin (formerly: Yearbook of the National Association of Secondary School Principals; Bulletin of the Department of Secondary-School Principals of the National Education Association) 1972.
MLA-viiteNational Association of Secondary School Principals. "NASSP Bulletin." NASSP Bulletin (formerly: Yearbook of the National Association of Secondary School Principals; Bulletin of the Department of Secondary-School Principals of the National Education Association), 1972.
Harvard-tyylinen lähdeviittausNational Association of Secondary School Principals. 1972. NASSP bulletin. NASSP Bulletin (formerly: Yearbook of the National Association of Secondary School Principals; Bulletin of the Department of Secondary-School Principals of the National Education Association).
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