APA (7th ed.) Citation

Fischer, H., Wolff, M., & Wolff, O. (1900). Ex Libris Oswald & Marie Wolff.

Chicago Style (17th ed.) Citation

Fischer, Helma, Marie Wolff, and Oswald Wolff. Ex Libris Oswald & Marie Wolff. [S. l, 1900.

MLA (9th ed.) Citation

Fischer, Helma, et al. Ex Libris Oswald & Marie Wolff. 1900.