MLA

Boos, Norbert; Aebi, Max, et al. Spinal Disorders. Springer Berlin Heidelberg, 2008.

APA

Boos, M., Aebi, M., Boos, N., & Zintel, I. (2008). Spinal Disorders. Springer Berlin Heidelberg.

Chicago

Boos, Norbert; Aebi, Max, Max Aebi, Norbert Boos, and Irene Zintel. Spinal Disorders. : Springer Berlin Heidelberg, 2008.