Dyfyniad APA

(1981). Institution of Civil Engineers Proceeding. Thomas Telford.

Dyfyniad Arddull Chicago

Institution of Civil Engineers Proceeding. London: Thomas Telford, 1981.

Dyfyniad MLA

Institution of Civil Engineers Proceeding. Thomas Telford, 1981.

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