Dyfyniad APA

(2000). Ecosystems around the world. New York: McGraw-Hill.

Dyfyniad Arddull Chicago

Ecosystems Around the World. New York: McGraw-Hill, 2000.

Dyfyniad MLA

Ecosystems Around the World. New York: McGraw-Hill, 2000.

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