Cita APA (7a ed.)

Werra, J., & Wacker, K. (1891). Das Mittelalter. Schöningh.

Cita Chicago Style (17a ed.)

Werra, Josef, y Karl Wacker. Das Mittelalter. Münster i. W: Schöningh, 1891.

Cita MLA (9a ed.)

Werra, Josef, y Karl Wacker. Das Mittelalter. Schöningh, 1891.