Cita APA (7a ed.)

Klett, T., Treuber, O., & Duerr, J. (1896). Mittelalter. Neff.

Cita Chicago Style (17a ed.)

Klett, Theodor, Oskar Treuber, y Julius Duerr. Mittelalter. Stuttgart: Neff, 1896.

Cita MLA (9a ed.)

Klett, Theodor, et al. Mittelalter. Neff, 1896.