United States. Soil Conservation Service. (1985). National engineering handbook. Water Resources Publications.
Lua i Stíl Chicago (17ú heag.)United States. Soil Conservation Service. National Engineering Handbook. Littleton, Colo: Water Resources Publications, 1985.
Lua MLA (9ú heag.)United States. Soil Conservation Service. National Engineering Handbook. Water Resources Publications, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.