APA (7th ed.) Citation

Widmark, M., Willis, H., & Dörries, M. (2012). Das Bibliotheksgeheimnis. Ueberreuter.

Chicago Style (17th ed.) Citation

Widmark, Martin, Helena Willis, and Maike Dörries. Das Bibliotheksgeheimnis. Wien: Ueberreuter, 2012.

MLA (9th ed.) Citation

Widmark, Martin, et al. Das Bibliotheksgeheimnis. Ueberreuter, 2012.

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