National Association of Secondary School Principals (U.S.). NASSP bulletin. Sage Publications.
Čikaški stil citiranja (17. izdanje)National Association of Secondary School Principals (U.S.). NASSP Bulletin. Thousand Oaks, CA: Sage Publications.
MLA način citiranja (9. izdanje)National Association of Secondary School Principals (U.S.). NASSP Bulletin. Sage Publications.
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