APA (7th ed.) Citation

Matthes, M., Matthes, K., & Lapointe, G. (1981). Québec. Libre Expression.

Chicago Style (17th ed.) Citation

Matthes, Mía, Klaus-Petter Matthes, and Gatien Lapointe. Québec. Montreal: Libre Expression, 1981.

MLA (9th ed.) Citation

Matthes, Mía, et al. Québec. Libre Expression, 1981.