Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.