Dyfyniad APA

(1999). Encyclopedia of Environmental pollution and cleanup. New York ; Chichester: John Wiley and Sons.

Dyfyniad Arddull Chicago

Encyclopedia of Environmental Pollution and Cleanup. New York ; Chichester: John Wiley and Sons, 1999.

Dyfyniad MLA

Encyclopedia of Environmental Pollution and Cleanup. New York ; Chichester: John Wiley and Sons, 1999.

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