Salazar, Rene; Louwaars, Niels P.; Visser, Bert(CGIAR System-wide Program on Property Rights and Collective Action, International Food Policy Research Institute, Washington, DC, 2006)
Ferrigno, Simon; Ratter, Saro G.; Ton, Peter; Simplice Vodouhê, Davo; Williamson, Stephanie; Wilson, John(International Institute for Environment and Development (IIED), London, 2005)