APA (7th ed.) Citation

Gide, A., Mockel, A., & Vanwelkenhuyzen, G. (1975). Correspondance (1891-1938). Droz.

Chicago Style (17th ed.) Citation

Gide, André, Albert Mockel, and Gustave Vanwelkenhuyzen. Correspondance (1891-1938). Geneve: Droz, 1975.

MLA (9th ed.) Citation

Gide, André, et al. Correspondance (1891-1938). Droz, 1975.