Dyfyniad APA

Environment and Resources: Geography in an urban age. New York: Macmillan Publishing.

Dyfyniad Arddull Chicago

Environment and Resources: Geography in an Urban Age. New York: Macmillan Publishing.

Dyfyniad MLA

Environment and Resources: Geography in an Urban Age. New York: Macmillan Publishing.

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