Dyfyniad APA
Riggs, J. L., & Shukla, S. (2010). Engineering economics. Tata McGraw Hill.
Dyfyniad Arddull Chicago
Riggs, James L., and Saurabh Shukla. Engineering Economics. New Delhi: Tata McGraw Hill, 2010.
Dyfyniad MLA
Riggs, James L., and Saurabh Shukla. Engineering Economics. Tata McGraw Hill, 2010.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.