Kassler, R., & Sielaff, R. (1988). Communication for adult educators (2nd edition.). Friedrich-Ebert-Stiftung (FES).
Chicago Style (17. basım) AtıfKassler, Reinhard, ve Rudiger Sielaff. Communication for Adult Educators. 2nd edition. Germany: Friedrich-Ebert-Stiftung (FES), 1988.
MLA (9th ed.) AtıfKassler, Reinhard, ve Rudiger Sielaff. Communication for Adult Educators. 2nd edition. Friedrich-Ebert-Stiftung (FES), 1988.
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