APA (7th ed.) Citation

Gaudaen, G., & Strens, E. (1961). Ex Libris Eugene Strens.

Chicago Style (17th ed.) Citation

Gaudaen, Gerard, and Eugène Strens. Ex Libris Eugene Strens. [S. l, 1961.

MLA (9th ed.) Citation

Gaudaen, Gerard, and Eugène Strens. Ex Libris Eugene Strens. 1961.

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