APA (7th ed.) Citation

Graf, F. W., & Wiegandt, K. (2009). Vorwort.

Chicago Style (17th ed.) Citation

Graf, Friedrich Wilhelm, and Klaus Wiegandt. Vorwort. 2009.

MLA (9th ed.) Citation

Graf, Friedrich Wilhelm, and Klaus Wiegandt. Vorwort. 2009.

Warning: These citations may not always be 100% accurate.