(1993). Engineering Economy / G.j. Thuesen And W.j. Fabrycky. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Engineering Economy / G.j. Thuesen And W.j. Fabrycky. Prentice-Hall, 1993.
Lua MLA (8ú heag.)Engineering Economy / G.j. Thuesen And W.j. Fabrycky. Prentice-Hall, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.