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1by Tillmann, H.J. (comp.), Hohenheim Univ., Stuttgart (Germany). Inst. fuer Agrarsoziologie, Landwirtschaftliche Beratung und Angewandte Psychologie ger, International Workshop on Agricultural Knowledge Systems and the Role of Extension eng 21-24 May 1991 Bad Boll (Germany), Albrecht, H. (comp.), Salas, M.A. (comp.), Dhamotharan, M. (comp.), Gottschalk, E. (comp.)
Published 1991Texto bibliotecaFAO IT