APA استشهاد

Carl and Martens, P. (1962). Exercises in German Pronunciation. Max Hueber Verlag.

استشهاد بنمط شيكاغو

Carl and Martens, Peter. Exercises in German Pronunciation. Munchen: Max Hueber Verlag, 1962.

MLA استشهاد

Carl and Martens, Peter. Exercises in German Pronunciation. Max Hueber Verlag, 1962.