APA (7th ed.) Citation

Zwetkoff, P., Habich, M., Aurich, G., Bliefert, U., Gaarder, J., Kirste, H., & Hey, R. (1999). Sofies Welt. Der Hör-Verlag.

Chicago Style (17th ed.) Citation

Zwetkoff, Peter, Matthias Habich, Gunda Aurich, Ulrike Bliefert, Jostein Gaarder, Hartmut Kirste, and Richard Hey. Sofies Welt. München: Der Hör-Verlag, 1999.

MLA (8th ed.) Citation

Zwetkoff, Peter, et al. Sofies Welt. Der Hör-Verlag, 1999.

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