APA (7th ed.) Citation

Schaefer, D. (1923). Das Mittelalter. Oldenbourg.

Chicago Style (17th ed.) Citation

Schaefer, Dietrich. Das Mittelalter. München und Berlin: Oldenbourg, 1923.

MLA (9th ed.) Citation

Schaefer, Dietrich. Das Mittelalter. Oldenbourg, 1923.

Warning: These citations may not always be 100% accurate.