DEGARMO, E. P. (1967). Engineering Economy E. Paul Degarmo. MacMillan Company.
Lua i Stíl Chicago (17ú heag.)DEGARMO, E. Paul. Engineering Economy E. Paul Degarmo. MacMillan Company, 1967.
Lua MLA (8ú heag.)DEGARMO, E. Paul. Engineering Economy E. Paul Degarmo. MacMillan Company, 1967.
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