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