Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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