1. Alderman, H. and Sahn, D.E. (1989). Understanding the seasonality of employment, wages and income; in, Sahn, D.E., (ed.) Seasonal variability in Third World Agriculture. Published for the International Food Policy Research Institute [by] (The John Hopkins University Press, Baltimore, Maryland, 81–106).
2. Bryceson, D.F. (2002). The scramble in Africa: Reorienting rural livelihoods. World Development, 30(5), 725-739.
3. Catley, A. (1997). Adapting participatory appraisal (PA) for the veterinary epidemiologist: PA tools for use in livestock disease data collection; in, Goodall, E.A. and Thrusfield, M.V. (eds). Proceedings of a Society for Veterinary Epidemiology and Preventive Medicine meeting held 9–11 April, 1997, at University College Chester, UK, 246–257.
4. Catley, A. & Mariner, J. C. (2002). Where there is no data: Participatory approaches to veterinary epidemiology in pastoral areas of the horn of Africa London, IIED issue paper no. 10.
5. Catley, A., Osman, J., Mawien, C., Jones, B. A., and Leyland T.J. (2002). Participatory analysis of seasonal incidences of diseases of cattle, disease vectors and rainfall in Southern Sudan. Preventive Veterinary Medicine, 53 (4), 275-284.