Vermillion, Douglas L.; Samad, Madar; Pusposutardjo, Suprodjo; Arif, Sigit S.; Rochdyanto, Saiful(International Water Management Institute (IWMI), Colombo, Sri Lanka, 2000)
Ahn, Toh-Kyeong; Lee, Myungsuk; Ruttan, Lore M.; Walker, James M.(Center for Applied Economics and Policy Research, Indiana University, Bloomington, Indiana, USA, 2006)