Hellwing, W. R. (1977). Zum Problem .. Päd. Hochsch. Ruhr.
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Chicago Style (17th ed.) Citation
Hellwing, Wolf Rüdiger. Zum Problem .. Dortmund: Päd. Hochsch. Ruhr, 1977.
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MLA citiranje
Hellwing, Wolf Rüdiger. Zum Problem .. Päd. Hochsch. Ruhr, 1977.
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