APA (7th ed.) Citation

Lambeck, G., Rühlmann, P., Wilmanns, E., & Beer, K. (1916). Das Mittelalter. Teubner.

Chicago Style (17th ed.) Citation

Lambeck, Gustav, Paul Rühlmann, Ernst Wilmanns, and K. Beer. Das Mittelalter. Leipzig [u.a.]: Teubner, 1916.

MLA (9th ed.) Citation

Lambeck, Gustav, et al. Das Mittelalter. Teubner, 1916.