APA (7th ed.) Citation

Voltaire & Savater, F. (1993). Cartas filosóficas. Altaya.

Chicago Style (17th ed.) Citation

Voltaire and Fernando Savater. Cartas Filosóficas. Barcelona: Altaya, 1993.

MLA (9th ed.) Citation

Voltaire and Fernando Savater. Cartas Filosóficas. Altaya, 1993.

Warning: These citations may not always be 100% accurate.