APA (7th ed.) Citation

Dahl, R., Barnils, R., & Blake, Q. (1988). Matilda. Empúries.

Chicago Style (17th ed.) Citation

Dahl, Roald, Ramon Barnils, and Quentin Blake. Matilda. Barcelona: Empúries, 1988.

MLA (9th ed.) Citation

Dahl, Roald, et al. Matilda. Empúries, 1988.