Boaks, P., Boyce, C., & Dudde, E. (1984). Deutsch konkret: A German course for young people. Langenscheidt.
Dyfyniad Arddull ChicagoBoaks, Peter, Christopher Boyce, and Ebba-Maria Dudde. Deutsch Konkret: A German Course for Young People. Berlin: Langenscheidt, 1984.
Dyfyniad MLABoaks, Peter, et al. Deutsch Konkret: A German Course for Young People. Langenscheidt, 1984.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.