Brown، Douglas R.؛ وآخرون (4 ديسمبر 2010). "Poverty alleviation and environmental restoration using the clean development mechanism: A case study from Humbo, Ethiopia". Environmental Management. ج. 48 ع. 2: 322–333. DOI:10.1007/s00267-010-9590-3. PMID:21132292. S2CID:829337.
Brown، Douglas R.؛ وآخرون (4 ديسمبر 2010). "Poverty alleviation and environmental restoration using the clean development mechanism: A case study from Humbo, Ethiopia". Environmental Management. ج. 48 ع. 2: 322–333. DOI:10.1007/s00267-010-9590-3. PMID:21132292. S2CID:829337.
Brown، Douglas R.؛ وآخرون (4 ديسمبر 2010). "Poverty alleviation and environmental restoration using the clean development mechanism: A case study from Humbo, Ethiopia". Environmental Management. ج. 48 ع. 2: 322–333. DOI:10.1007/s00267-010-9590-3. PMID:21132292. S2CID:829337.
World Resources Institute (WRI) in collaboration with United Nations Development Programme, United Nations Environment Programme, and World Bank. 2008, Turning Back the Desert: How Farmers Have Transformed Niger's Landscapes and Livelihoods, Chapter 3 in World Resources 2008: Roots of Resilience – Growing the Wealth of the Poor, http://www.wri.org/publication/world-resources-2008-roots-of-resilience. نسخة محفوظة 2013-06-29 على موقع واي باك مشين.
World Resources Institute (WRI) in collaboration with United Nations Development Programme, United Nations Environment Programme, and World Bank. 2008, Turning Back the Desert: How Farmers Have Transformed Niger's Landscapes and Livelihoods, Chapter 3 in World Resources 2008: Roots of Resilience – Growing the Wealth of the Poor, http://www.wri.org/publication/world-resources-2008-roots-of-resilience. نسخة محفوظة 2013-06-29 على موقع واي باك مشين.