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Shiferaw, B and Freeman, H A and Navrud, S (2005) Valuation methods and approaches for assessing natural resource management impacts. In: Natural resource management in agriculture: methods for assessing economic and environmental impacts. CAB International, Wallingford, Oxon, UK, pp. 19-51. ISBN 0-85199-828-3
Shiferaw, B and Freeman, H A and Navrud, S (2005) Valuation methods and approaches for assessing natural resource management impacts. In: Natural resource management in agriculture: methods for assessing economic and environmental impacts. CAB International, Wallingford, Oxon, UK, pp. 19-51. ISBN 0-85199-828-3