Londres, Overseas Development Institute: “Open-range management and property rights in pastoral Africa: a case of spontaneous range enclosure in south Darfur”, Sudan, Roy H. Behnke Jr., agosto de 1985
لندن، معهد التنمية لما وراء البحار: "Open-range management and property rights in pastoral Africa: a case of spontaneous range enclosures in South Darfur," Sudan, Roy Behnke Jr., August 1985