APA (7th ed.) Citation

Hansen, H., & Stelzner, F. (1981). Proktologie. Springer.

Chicago Style (17th ed.) Citation

Hansen, Henning, and Friedrich Stelzner. Proktologie. Berlin [u.a.]: Springer, 1981.

MLA (9th ed.) Citation

Hansen, Henning, and Friedrich Stelzner. Proktologie. Springer, 1981.