Torney, Judith V., Oppenheim, Abraham N. und Farnen, Russell F. (1975): Civic education in ten countries. International studies in evaluation VI, Stockholm/New York: Almqvist & Wiksell/Wiley.
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Torney-Purta, J., Oppenheim, A. N. & Farnen, R. F. (1975). Civic Education in Ten Countries: An Empirical Study. Stockholm: Almqvist & Wiksell.
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Torney, J. V., Oppenheim, A. N., Farnen, R. F. (1975). Civic Education in Ten Countries: An Empirical Study. Stockholm/New York: Almqvist & Wiksell/Wiley. International studies in evaluation VI.
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