APA (7th ed.) Citation

Winkelmann, E. Kaiser Friedrich II. Duncker & Humblot.

Chicago Style (17th ed.) Citation

Winkelmann, Eduard. Kaiser Friedrich II. Leipzig: Duncker & Humblot.

MLA (9th ed.) Citation

Winkelmann, Eduard. Kaiser Friedrich II. Duncker & Humblot.

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