Cita APA (7th ed.)
Zimmermann, H. (1975). Das Mittelalter. Westermann.
Cita Chicago (17th ed.)
Zimmermann, Harald. Das Mittelalter. Braunschweig: Westermann, 1975.
Cita MLA (9th ed.)
Zimmermann, Harald. Das Mittelalter. Westermann, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.