Dyfyniad APA

Johnson, G. B. (2006). The living world. Boston, MA: McGraw-Hill.

Dyfyniad Arddull Chicago

Johnson, George Brooks. The Living World. Boston, MA: McGraw-Hill, 2006.

Dyfyniad MLA

Johnson, George Brooks. The Living World. Boston, MA: McGraw-Hill, 2006.

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