BLANK, L. T., & TARQUIN, A. J. (1998). Engineering economy.-- Ed.4. McGraw-Hill International.
Lua i Stíl Chicago (17ú heag.)BLANK, Leland T., agus Anthony J. TARQUIN. Engineering Economy.-- Ed.4. Singapore: McGraw-Hill International, 1998.
Lua MLA (9ú heag.)BLANK, Leland T., agus Anthony J. TARQUIN. Engineering Economy.-- Ed.4. McGraw-Hill International, 1998.
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