APA (7th ed.) Citation

Courtoit, E., & Gale, G. C. (1919). The commercial student's course of English (2nd ed.). Maison d'Édition A. de Boeck.

Chicago Style (17th ed.) Citation

Courtoit, Edmond, and George C. Gale. The Commercial Student's Course of English. 2nd ed. Bruxelles: Maison d'Édition A. de Boeck, 1919.

MLA (9th ed.) Citation

Courtoit, Edmond, and George C. Gale. The Commercial Student's Course of English. 2nd ed. Maison d'Édition A. de Boeck, 1919.