Dyfyniad APA

(1981). Appropriate Technology in Civil Engineering. Thomas Telford.

Dyfyniad Arddull Chicago

Appropriate Technology in Civil Engineering. London: Thomas Telford, 1981.

Dyfyniad MLA

Appropriate Technology in Civil Engineering. Thomas Telford, 1981.

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