Ison, Raymond
(1993). Soft systems: a non computer view of decision support.
In: Stuth, J. W and Lyons, B. G eds.
Decision Support Systems for the Management of Grazing Lands: Emerging Issues.
Man and the Biosphere Series (11).
Paris, France/Carnforth, U.K.: United Nations Educational, Scientific and Cultural Organizations (UNESCO)/Parthenon Publishing Group Limited, pp. 83–118.