Dyfyniad APA

Middleton, N., & Thomas, D. (1997). World atlas of desertification (2nd ed.). Arnold.

Dyfyniad Arddull Chicago

Middleton, Nick, and David Thomas. World Atlas of Desertification. 2nd ed. London: Arnold, 1997.

Dyfyniad MLA

Middleton, Nick, and David Thomas. World Atlas of Desertification. 2nd ed. Arnold, 1997.

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