(1992). Engineering Cost Estimating / Phillip F. Ostwald. Printice Hall.
Lua i Stíl Chicago (17ú heag.)Engineering Cost Estimating / Phillip F. Ostwald. Printice Hall, 1992.
Lua MLA (8ú heag.)Engineering Cost Estimating / Phillip F. Ostwald. Printice Hall, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.