Não informado. (2002). Parks & Recreation. National Recreation and Park Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Parks & Recreation. Arlington, Va: National Recreation and Park Association, 2002.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Parks & Recreation. National Recreation and Park Association, 2002.
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