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Freeman, H A and Shiferaw, B and Swinton, S M (2005) Assessing the impacts of natural resource management interventions in agriculture: concepts, issues and challenges. In: Natural resource management in agriculture: methods for assessing economic and environmental impacts. CAB International, Wallingford, Oxon, UK, pp. 3-16. ISBN 0-85199-828-3
Swinton, S M and Shiferaw, B and Freeman, H A (2005) Towards comprehensive approaches in assessing NRM impacts: what we know and what we need to know. In: Natural resource management in agriculture: methods for assessing economic and environmental impacts. CAB International, Wallingford, Oxon, UK, pp. 361-275. ISBN 0-85199-828-3