(2006). Soil and water conservation engineering. Thomson Delmar learning.
Lua i Stíl Chicago (17ú heag.)Soil and Water Conservation Engineering. Thomson Delmar learning, 2006.
Lua MLA (8ú heag.)Soil and Water Conservation Engineering. Thomson Delmar learning, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.