Dyfyniad APA
Riggs, J. L., & Bedworth, D. D. (2011). Engineering economics (4th ed.). Tata McGraw-Hill.
Dyfyniad Arddull Chicago
Riggs, James L., and David D/Randhawa Bedworth. Engineering Economics. 4th ed. New Delhi: Tata McGraw-Hill, 2011.
Dyfyniad MLA
Riggs, James L., and David D/Randhawa Bedworth. Engineering Economics. 4th ed. Tata McGraw-Hill, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.