National Association of Secondary School Principals (U.S.). (1972). NASSP bulletin. National Association of Secondary School Principals].
Chicago-viite (17. p.)National Association of Secondary School Principals (U.S.). NASSP Bulletin. [Reston, Va. [etc.]: National Association of Secondary School Principals], 1972.
MLA-viite (8. p.)National Association of Secondary School Principals (U.S.). NASSP Bulletin. National Association of Secondary School Principals], 1972.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.