Dyfyniad APA

(1980). Engineering costs and production economics. Elsevier.

Dyfyniad Arddull Chicago

Engineering Costs and Production Economics. [Amsterdam]: Elsevier, 1980.

Dyfyniad MLA

Engineering Costs and Production Economics. Elsevier, 1980.

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