APA (7th ed.) Citation

zm, Rösch, T., & Classen, M. Gastroenterologic Endosonography. Textbook and atlas.

Chicago Style (17th ed.) Citation

zm, T. Rösch, and M. Classen. Gastroenterologic Endosonography. Textbook and Atlas.

MLA (9th ed.) Citation

zm, et al. Gastroenterologic Endosonography. Textbook and Atlas.