Barends, F. B. J. (1980). Nonlinearity in groundwater flow. Delft Soil Mechanics Laboratory.
Lua i Stíl Chicago (17ú heag.)Barends, F. B. J. Nonlinearity in Groundwater Flow. Delft: Delft Soil Mechanics Laboratory, 1980.
Lua MLA (8ú heag.)Barends, F. B. J. Nonlinearity in Groundwater Flow. Delft Soil Mechanics Laboratory, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.