Dyfyniad APA

(2011).  Sustainability in america''s cities: Creating the green metropolis.  Island press.

Dyfyniad Arddull Chicago

 Sustainability in America''s Cities: Creating the Green Metropolis.  Island press, 2011.

Dyfyniad MLA

 Sustainability in America''s Cities: Creating the Green Metropolis.  Island press, 2011.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.