APA (7th ed.) Citation

Siwertz, S. (1909). Zwei Welten.

Chicago Style (17th ed.) Citation

Siwertz, Sigfrid. Zwei Welten. 1909.

MLA (9th ed.) Citation

Siwertz, Sigfrid. Zwei Welten. 1909.

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