Carl and Martens, P. (1962). Exercises in German Pronunciation. Max Hueber Verlag.
Čikaški stil citiranjaCarl and Martens, Peter. Exercises in German Pronunciation. Munchen: Max Hueber Verlag, 1962.
MLA način citiranjaCarl and Martens, Peter. Exercises in German Pronunciation. Max Hueber Verlag, 1962.
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