Wittmer, Heidi; Birner, Regina(CGIAR System-wide Program on Property Rights and Collective Action, International Food Policy Research Institute, Washington, DC, 2005)
Cronkleton, Peter; Taylor, Peter Leigh; Barry, Deborah; Stone-Jovicich, Samantha; Schmink, Marianne(Center for International Forestry Research (CIFOR), Bogor, Indonesia, 2008)