Cita APA (7a ed.)

Héroux, B., & Behrsing, H. (1906). Ex Libris Helene Behrsing.

Cita Chicago Style (17a ed.)

Héroux, Bruno, y Helene Behrsing. Ex Libris Helene Behrsing. [S. l, 1906.

Cita MLA (9a ed.)

Héroux, Bruno, y Helene Behrsing. Ex Libris Helene Behrsing. 1906.