Dyfyniad APA

Van der Ryn, S., & Cowan, S. (2007). Ecological design (10th anniversary ed.). Island Press.

Dyfyniad Arddull Chicago

Van der Ryn, Sim, and Stuart Cowan. Ecological Design. 10th anniversary ed. Washington, DC: Island Press, 2007.

Dyfyniad MLA

Van der Ryn, Sim, and Stuart Cowan. Ecological Design. 10th anniversary ed. Island Press, 2007.

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