Hall, P., & Pfeiffer, U. (2000). Urban future 21: A global agenda for twenty-first century cities. London: E & FN Spon.
Dyfyniad Arddull ChicagoHall, Peter, và Ulrich Pfeiffer. Urban Future 21: A Global Agenda for Twenty-first Century Cities. London: E & FN Spon, 2000.
Dyfyniad MLAHall, Peter, và Ulrich Pfeiffer. Urban Future 21: A Global Agenda for Twenty-first Century Cities. London: E & FN Spon, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.