Παραπομπή APA

(1962). The future of outdoor recreation in metropolitan regions of the United States. Washington, D.C: Outdoor Recreation for America.

Παραπομπή Chicago Style

The Future of Outdoor Recreation in Metropolitan Regions of the United States. Washington, D.C: Outdoor Recreation for America, 1962.

Παραπομπή MLA

The Future of Outdoor Recreation in Metropolitan Regions of the United States. Washington, D.C: Outdoor Recreation for America, 1962.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.