Dyfyniad APA

Abbott, P. L. (2008). Natural disasters (6th ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Abbott, Patrick L. Natural Disasters. 6th ed. Boston: McGraw-Hill, 2008.

Dyfyniad MLA

Abbott, Patrick L. Natural Disasters. 6th ed. McGraw-Hill, 2008.

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