Williamson, R. (1993). To meet early adolescent needs. National Association of Secondary School Principals.
Chicago-Zitierstil (17. Ausg.)Williamson, Ronald. To Meet Early Adolescent Needs. Reston: National Association of Secondary School Principals, 1993.
MLA-Zitierstil (9. Ausg.)Williamson, Ronald. To Meet Early Adolescent Needs. National Association of Secondary School Principals, 1993.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.