APA (7th ed.) Citation

Sickel, T. (1980). Die Urkunden Otto des III. Monumenta Germaniae Historica.

Chicago Style (17th ed.) Citation

Sickel, Theodor. Die Urkunden Otto Des III. München: Monumenta Germaniae Historica, 1980.

MLA (9th ed.) Citation

Sickel, Theodor. Die Urkunden Otto Des III. Monumenta Germaniae Historica, 1980.

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