APA (7th ed.) Citation

Kollwitz, K., & Kollwitz, H. (1988). The diary and letters of Kaethe Kollwitz. Northwestern University Press.

Chicago Style (17th ed.) Citation

Kollwitz, Käthe, and Hans Kollwitz. The Diary and Letters of Kaethe Kollwitz. Evanston, Ill.: Northwestern University Press, 1988.

MLA (9th ed.) Citation

Kollwitz, Käthe, and Hans Kollwitz. The Diary and Letters of Kaethe Kollwitz. Northwestern University Press, 1988.