APA (7th ed.) Citation

Sommerfeld, A. (1919). Nikolaus II. Continent.

Chicago Style (17th ed.) Citation

Sommerfeld, Adolf. Nikolaus II. Berlin: Continent, 1919.

MLA (9th ed.) Citation

Sommerfeld, Adolf. Nikolaus II. Continent, 1919.

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