Vermillion, Douglas L.; Samad, Madar; Pusposutardjo, Suprodjo; Arif, Sigit S.; Rochdyanto, Saiful(International Water Management Institute (IWMI), Colombo, Sri Lanka, 2000)
Baland, Jean-Marie; Francois, Patrick(Leverhulme Centre for Market and Public Organisation, Department of Economics, University of Bristol, Bristol, United Kingdom, 2003)