Citazione Stile APA (7a Edizione)

Porter, D. R. (1988). Flexible zoning: How it works. Urban Land Institute.

Citazione stile Chigago Style (17a edizione)

Porter, Douglas R. Flexible Zoning: How It Works. Washington: Urban Land Institute, 1988.

Citatione MLA (9a ed.)

Porter, Douglas R. Flexible Zoning: How It Works. Urban Land Institute, 1988.