APA (7th ed.) Citation

Héroux, B., & Sievert, C. (1906). Ex Libris Carl Sievert.

Chicago Style (17th ed.) Citation

Héroux, Bruno, and Carl Sievert. Ex Libris Carl Sievert. [Miejsce nieznane], 1906.

MLA (9th ed.) Citation

Héroux, Bruno, and Carl Sievert. Ex Libris Carl Sievert. 1906.

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