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1دورية أكاديمية
المصدر: Springer, Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development. 23(6):9223-9242
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2كتاب
المؤلفون: Makhanya, Edward M.; Davis, Nerhene C.
المصدر: The sustainability of rural systems in developing countries : Montréal, pg. 85-101. 2008