APA (7th ed.) Citation

Asimov, I., Shannon, D., & Casas, G. (1999). Amigos robots. Vicens Vives.

Chicago Style (17th ed.) Citation

Asimov, Isaac, David Shannon, and Gabriel Casas. Amigos Robots. Barcelona: Vicens Vives, 1999.

MLA (9th ed.) Citation

Asimov, Isaac, et al. Amigos Robots. Vicens Vives, 1999.