THUESEN, G. Engineering economy. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)THUESEN, G.J. Engineering Economy. Prentice Hall.
Lua MLA (8ú heag.)THUESEN, G.J. Engineering Economy. Prentice Hall.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.