APA (7th ed.) Citation

Tolstoi, L., Agudo, M., & Cardona Castro, F. Cartas.

Chicago Style (17th ed.) Citation

Tolstoi, León, Miguel Agudo, and Francisco-Luis Cardona Castro. Cartas. Barcelona.

MLA (9th ed.) Citation

Tolstoi, León, et al. Cartas.

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