Blank, L. (1998). Engineering Economy Leland Blank, Anthony Tarquin. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Blank, Leland. Engineering Economy Leland Blank, Anthony Tarquin. McGraw-Hill, 1998.
Lua MLA (8ú heag.)Blank, Leland. Engineering Economy Leland Blank, Anthony Tarquin. McGraw-Hill, 1998.
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