Gray, K. (2007). Civil engineering technology. Global Media.
Lua i Stíl Chicago (17ú heag.)Gray, Kevin. Civil Engineering Technology. Chandni Chowk, Delhi: Global Media, 2007.
Lua MLA (9ú heag.)Gray, Kevin. Civil Engineering Technology. Global Media, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.