APA (7th ed.) Citation

Heilborn, A., & Kollwitz, K. I. (1949). Käthe Kollwitz. Lemmer.

Chicago Style (17th ed.) Citation

Heilborn, Adolf, and Käthe Illustrator Kollwitz. Käthe Kollwitz. Berlin: Lemmer, 1949.

MLA (8th ed.) Citation

Heilborn, Adolf, and Käthe Illustrator Kollwitz. Käthe Kollwitz. Lemmer, 1949.

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