Pollmann-Schult, Matthias/Mayer, Karl Ulrich (2004), »Returns to Skills: Vocational Training in Germany 1935-2000«, Yale Journal of Sociology, Jg. 4, Fall 2004, S. 73-98.
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Pollmann-Schult, M. M., Ulrich, K. (2004). Returns to Skills: Vocational Training in Germany 1935-2000«. Yale Journal of Sociology, 4 pp. 73-98.
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