Bernard, L. L. (1925) "A classification of environments."Amer. J. of Sociology31 (November)
2.
. Davies, J. C. (1970) The Politics of PollutionNew York: Pegasus .
3.
Heberle, R. (1951) Social MovementsNew York: Appleton-Century-Crofts .
4.
Kruse, H. (1972) "Development and environment: reflections on a subject area of the Stockholm Conference."Internationales Asienforum 3
5.
. Meadows, P. (1945-1946) "Theses on social movements."Social Forces24.
6.
Modelski, G. (1961) "Agraria and industria: two models of the international system," in K. Knorr and S. Verba (eds.) The International System. Princeton: Princeton Univ. Press.
7.
Nettl, J. P. and R. Robertson (1968) International Systems and the Modernization of SocietiesLondon. Faber & Faber.
8.
UN Conference on the Human Environment (1971 ) "Development and Environment." Document A/Conference 48/10.
9.
Ward, B. and R. Dubos (1972) Only One Earth. London: André Deutsch.