DEGARMO, E. P. (1979). Engineering economy - E. Paul DeGarmo, John R. Canada, William G. Sullivan. Collier Macmillan.
Lua i Stíl Chicago (17ú heag.)DEGARMO, E. Paul. Engineering Economy - E. Paul DeGarmo, John R. Canada, William G. Sullivan. Collier Macmillan, 1979.
Lua MLA (8ú heag.)DEGARMO, E. Paul. Engineering Economy - E. Paul DeGarmo, John R. Canada, William G. Sullivan. Collier Macmillan, 1979.
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