APA (7th ed.) Citation

Neumann, H. J., Eberle, H., & Somers, N. (2013). Was Hitler ill?: A final diagnosis. Polity.

Chicago Style (17th ed.) Citation

Neumann, Hans Joachim, Henrik Eberle, and Nick Somers. Was Hitler Ill?: A Final Diagnosis. Cambridge: Polity, 2013.

MLA (8th ed.) Citation

Neumann, Hans Joachim, et al. Was Hitler Ill?: A Final Diagnosis. Polity, 2013.