1 Walker, T. S.; Ryan, J. G. 1990. Village and household economies in India's semi-arid tropics. Baltimore, UK: Johns Hopkins University Press. xx, 394p.
(Location: IWMI-HQ Call no: 307 G635 WAL Record No: H07325)
2 Walker, T. S.; Alwang, J. (Eds.) 2015. Crop improvement, adoption, and impact of improved varieties in food crops in Sub-Saharan Africa. Montpellier, France: CGIAR; Wallingford, UK: CABI. 450p.