Viessman, W., & Lewis, G. L. (1996). Introduction to hydrology (4th ed.). Harper Collins.
Lua i Stíl Chicago (17ú heag.)Viessman, Warren, agus Gary L. Lewis. Introduction to Hydrology. 4th ed. Glenview, III: Harper Collins, 1996.
Lua MLA (9ú heag.)Viessman, Warren, agus Gary L. Lewis. Introduction to Hydrology. 4th ed. Harper Collins, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.