Birner, Regina; Gunaweera, Hasantha(CGIAR System-Wide Program on Property Rights and Collective Action, International Food Policy Research Institute (IFPRI), Washington, DC, 2001)
Mwangi, Esther; Dohrn, Stephan(CGIAR System-wide Program on Property Rights and Collective Action, International Food Policy Research Institute, Washington, DC, 2006)