Gibson, Clark C.; McKean, Margaret A.; Ostrom, Elinor(Indiana University, International Forestry Resources and Institutions (IFRI) Research Program et al., Bloomington, IN, 1998)
Giejer, Joost C. M. A.; Svendsen, Mark; Vermillion, Douglas L.(International Irrigation Management Institute and Food and Agriculture Organization of the United Nations, 1996)