Cita APA (7th ed.)

National Association of Secondary School Principals (U.S.). NASSP bulletin. Sage Publications.

Cita Chicago (17th ed.)

National Association of Secondary School Principals (U.S.). NASSP Bulletin. Thousand Oaks, CA: Sage Publications.

Cita MLA (9th ed.)

National Association of Secondary School Principals (U.S.). NASSP Bulletin. Sage Publications.

Atenció: Aquestes cites poden no estar 100% correctes.