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McConnell, Douglas John ,  Dillon, John L. ,  [Farm management for Asia: a systems approach] ,  Farm management for Asia: a systems approach

Anderson, Jock R. ,  Dillon, John L. ,  [Risk analysis in dryland farming systems] ,  Risk analysis in dryland farming systems

Norman, D.W. ,  Modiakgotla, E. ,  Siebert, J.D. ,  Worman, F.D. ,  [The farming systems approach to development and appropriate technology generation] ,  The farming systems approach to development and appropriate technology generation