APA (7th ed.) Citation

Gasche, H., Janssen, С., & Degraeve, A. (1993). Outils bibliographiques.

Chicago Style (17th ed.) Citation

Gasche, H., С Janssen, and A. Degraeve. Outils Bibliographiques. 1993.

MLA (8th ed.) Citation

Gasche, H., et al. Outils Bibliographiques. 1993.