Walmsley, Danny; Havenga, Tommie; Braune, Eberhard; Schmidt, Chris; Prasad, Krishna; Van Koppen, Barbara(International Water Management Institute, Colombo, Sri Lanka, 2004)
Dohrn, Stephan(CGIAR System-wide Program on Property Rights and Collective Action, International Food Policy Research Institute, Washington, DC, USA, 2006)
Wilson, Emma; MacGregor, James; Macqueen, Duncan; Vermeulen, Sonja; Vorley, William T.; Zarsky, Lyuba(International Institute for Environment and Development (IIED), London, 2009)