WATSON, J. (1994). Highway Construction & Maintenance John Watson. John Willey & Sons.
Lua i Stíl Chicago (17ú heag.)WATSON, John. Highway Construction & Maintenance John Watson. John Willey & Sons, 1994.
Lua MLA (8ú heag.)WATSON, John. Highway Construction & Maintenance John Watson. John Willey & Sons, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.