Não informado. Trends. National School Public Relations Association.
Chicago-Zitierstil (17. Ausg.)Não informado. Trends. Washington: National School Public Relations Association.
MLA-Zitierstil (8. Ausg.)Não informado. Trends. National School Public Relations Association.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.