Παραπομπή APA

(1962). Economic studies of outdoor recreation. Washington, D.C: Outdoor Recreation for America.

Παραπομπή Chicago Style

Economic Studies of Outdoor Recreation. Washington, D.C: Outdoor Recreation for America, 1962.

Παραπομπή MLA

Economic Studies of Outdoor Recreation. Washington, D.C: Outdoor Recreation for America, 1962.

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