, 1990, Liberating systems theory, Springer, Dordrecht.
, 1989, Whatever happened to general systems theory?, in R. L. Flood, M. C. Jackson & P. Keys (eds.), Systems prospects, Dordrecht, Springer, pp. 61-66.
with Gregory, W. , 1989, Systems: past, present, and future, in R. L. Flood, M. C. Jackson & P. Keys (eds.), Systems prospects, Dordrecht, Springer, pp. 55-60.
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with Jackson, M.C. , Keys, P. , 1989b, Systems thinking and theory, in R. L. Flood, M. C. Jackson & P. Keys (eds.), Systems prospects, Dordrecht, Springer, pp. 1-2.
with Jackson, M.C. , Keys, P. (eds) , 1989a, Systems prospects: the next ten years of systems research, Springer, Dordrecht.