Não informado. (2002). Parks & Recreation. American Institute of Park Executives.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Parks & Recreation. Wheeling, Ill: American Institute of Park Executives, 2002.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Parks & Recreation. American Institute of Park Executives, 2002.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.