Dyfyniad APA

(1979). Readings in environment, 1979-80. Dushkin Pub. Group.

Dyfyniad Arddull Chicago

Readings in Environment, 1979-80. Guilford, Conn: Dushkin Pub. Group, 1979.

Dyfyniad MLA

Readings in Environment, 1979-80. Dushkin Pub. Group, 1979.

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