APA (7th ed.) Citation

Union académique internationale, Hoppin, J. C., & Gallatin, A. (1926). Hoppin and Gallatin collections. Libraire Ancienne Édouard Champion.

Chicago Style (17th ed.) Citation

Union académique internationale, Joseph Clark Hoppin, and Albert Gallatin. Hoppin and Gallatin Collections. Paris: Libraire Ancienne Édouard Champion, 1926.

MLA (9th ed.) Citation

Union académique internationale, et al. Hoppin and Gallatin Collections. Libraire Ancienne Édouard Champion, 1926.