NARDON, J. D. (1995). Bridge And Structure Estimating. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)NARDON, J. David. Bridge And Structure Estimating. McGraw-Hill, 1995.
Lua MLA (8ú heag.)NARDON, J. David. Bridge And Structure Estimating. McGraw-Hill, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.