National Association of Secondary School Principals (U.S.). (1972). NASSP bulletin. National Association of Secondary School Principals].
Chicago-referens (17:e uppl.)National Association of Secondary School Principals (U.S.). NASSP Bulletin. [Reston, Va. [etc.]: National Association of Secondary School Principals], 1972.
MLA-referens (8:e uppl.)National Association of Secondary School Principals (U.S.). NASSP Bulletin. National Association of Secondary School Principals], 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.