Riggs, J. L. (2004). Engineering Economics (7th ed.). Tata McGraw-Hill Publishing Company Ltd.
Lua i Stíl Chicago (17ú heag.)Riggs, James L. Engineering Economics. 7th ed. New Delhi: Tata McGraw-Hill Publishing Company Ltd, 2004.
Lua MLA (9ú heag.)Riggs, James L. Engineering Economics. 7th ed. Tata McGraw-Hill Publishing Company Ltd, 2004.
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