Não informado. (2002). Parks & Recreation. American Institute of Park Executives.
Chicago-Zitierstil (17. Ausg.)Não informado. Parks & Recreation. Wheeling, Ill: American Institute of Park Executives, 2002.
MLA-Zitierstil (8. Ausg.)Não informado. Parks & Recreation. American Institute of Park Executives, 2002.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.