.Blank, L. T., & Tarquin, A. (1983). Engineering economy (6th. ed.). McGraw-Hill.
Dyfyniad Arddull Chicago.Blank, Leland T., and Anthony Tarquin. Engineering Economy. 6th. ed. Boston: McGraw-Hill, 1983.
Dyfyniad MLA.Blank, Leland T., and Anthony Tarquin. Engineering Economy. 6th. ed. McGraw-Hill, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.