WRIGHT, P. H. (2004). Highway engineering. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)WRIGHT, Paul H. Highway Engineering. John Wiley & Sons, 2004.
Lua MLA (9ú heag.)WRIGHT, Paul H. Highway Engineering. John Wiley & Sons, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.