Cita APA (7a ed.)

Ade, M., & Saeng, E. (1900). Ex-Libris Erna Saeng.

Cita Chicago Style (17a ed.)

Ade, Mathilde, y Erna Saeng. Ex-Libris Erna Saeng. [S. l, 1900.

Cita MLA (9a ed.)

Ade, Mathilde, y Erna Saeng. Ex-Libris Erna Saeng. 1900.