Overseas Development Institute de Londres : « Open-range management and property rights in pastoral Africa : a case of spontaneous range enclosure in South Darfur », Soudan, Roy H. Behnke Jr., août 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