Παραπομπή APA

(1973). Working papers in alternative futures and environmental quality. Washington, D.C: Environmental Protection Agency.

Παραπομπή Chicago Style

Working Papers in Alternative Futures and Environmental Quality. Washington, D.C: Environmental Protection Agency, 1973.

Παραπομπή MLA

Working Papers in Alternative Futures and Environmental Quality. Washington, D.C: Environmental Protection Agency, 1973.

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