Opp KD, Burow-Auffarth K and Heinrichs U (1981) Conditions for conventional and unconventional political participation: An empirical test of economic and sociological hypotheses. European Journal of Political Research 9(2): 147-168. https://doi.org/10.1111/j.1475-6765.1981.tb00596.x
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Opp, K. D., K, B. A., Heinrichs, U. (1981). Conditions for conventional and unconventional political participation: An empirical test of economic and sociological hypotheses. European Journal of Political Research, 9(2), pp. 147-168.
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