Brown, David; Howes, Mick; Hussein, Karim; Longley, Catherine; Swindell, Ken(Agricultural Research and Extension Network (AGREN), Overseas Development Institute, London, 2002)
Quisumbing, Agnes R.; McNiven, Scott; Godquin, Marie(CGIAR System-wide Program on Property Rights and Collective Action, International Food Policy Research Institute, Washington, DC, 2008)