Harger, W. G., & Bonney, E. A. Handbook for highway engineers.
Lua i Stíl Chicago (17ú heag.)Harger, Wilson G., agus Edmund A. Bonney. Handbook for Highway Engineers.
Lua MLA (8ú heag.)Harger, Wilson G., agus Edmund A. Bonney. Handbook for Highway Engineers.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.