Breuning-Madsen, H. “S. El Guindy and I. A. Risseeuw: Research on Water Management of Rice Fields in the Nile Delta, Egypt. (ILRI Publication, 41.)”. Geografisk Tidsskrift - Danish Journal of Geography, vol. 89, Jan. 1989, https://tidsskrift.dk/geografisktidsskrift/article/view/44675.