Dyfyniad APA

(1975). Hazards in Tunnelling and on Faleswork. Institution of Civil Engineers.

Dyfyniad Arddull Chicago

Hazards in Tunnelling and on Faleswork. London: Institution of Civil Engineers, 1975.

Dyfyniad MLA

Hazards in Tunnelling and on Faleswork. Institution of Civil Engineers, 1975.

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