APA (7th ed.) Citation

Cicerón, M. T., Fohlen, G., & Humbert, J. (1931). Tusculanes. Belles Lettres.

Chicago Style (17th ed.) Citation

Cicerón, Marco Tulio, Georges Fohlen, and Jules Humbert. Tusculanes. Paris: Belles Lettres, 1931.

MLA (9th ed.) Citation

Cicerón, Marco Tulio, et al. Tusculanes. Belles Lettres, 1931.