Dyfyniad APA

(1988). Transaction 1988. American Association of Cost Engineers.

Dyfyniad Arddull Chicago

Transaction 1988. New York: American Association of Cost Engineers, 1988.

Dyfyniad MLA

Transaction 1988. American Association of Cost Engineers, 1988.

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