FAO Irrigation and Drainage Paper No. 56. Crop Evapotranspiration. Richard G. Allen, Luis S. Pereira, Dirk Raes e Martin Smith (1998)
FAO Irrigation and Drainage Paper No. 66. Crop Yield Response to Water Use. Pasquale Steduto, Theodore C. Hsiao, Elias Fereres e Dirk Raes (2012)