APA (7th ed.) Citation

Laehr, G. (1931). Vom mittelalterlichen Imperium Romanum. de Gruyter.

Chicago Style (17th ed.) Citation

Laehr, Gerhard. Vom Mittelalterlichen Imperium Romanum. Berlin: de Gruyter, 1931.

MLA (9th ed.) Citation

Laehr, Gerhard. Vom Mittelalterlichen Imperium Romanum. de Gruyter, 1931.

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