Dyfyniad APA

Abbott, P. L. (2014). Natural disasters (9th ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Abbott, Patrick L. Natural Disasters. 9th ed. New York: McGraw-Hill, 2014.

Dyfyniad MLA

Abbott, Patrick L. Natural Disasters. 9th ed. McGraw-Hill, 2014.

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