APA (7th ed.) Citation

Schönfeldt, H. c. 2. J., & Zühlsdorff, K. (1951). Commercial English for beginners (4. Aufl.). Winkler.

Chicago Style (17th ed.) Citation

Schönfeldt, Hellmut ca. 20. Jh, and Karl-Heinz Zühlsdorff. Commercial English for Beginners. 4. Aufl. Darmstadt: Winkler, 1951.

MLA (9th ed.) Citation

Schönfeldt, Hellmut ca. 20. Jh, and Karl-Heinz Zühlsdorff. Commercial English for Beginners. 4. Aufl. Winkler, 1951.