MITCHELL R.L. (1980). ENGINEERING ECONOMICS. JOHN WILEY & SONS.
Lua i Stíl Chicago (17ú heag.)MITCHELL R.L. ENGINEERING ECONOMICS. N.Y: JOHN WILEY & SONS, 1980.
Lua MLA (9ú heag.)MITCHELL R.L. ENGINEERING ECONOMICS. JOHN WILEY & SONS, 1980.
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