DEGARMO, E. P. (1993). Engineering economy /E. Paul Degarmo, William G. Sullivan and James Bontadelli. MacMillan Publishing Co.
Lua i Stíl Chicago (17ú heag.)DEGARMO, E. Paul. Engineering Economy /E. Paul Degarmo, William G. Sullivan and James Bontadelli. MacMillan Publishing Co, 1993.
Lua MLA (8ú heag.)DEGARMO, E. Paul. Engineering Economy /E. Paul Degarmo, William G. Sullivan and James Bontadelli. MacMillan Publishing Co, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.