APA (7th ed.) Citation

Chopin, F., Opieński, H., & Voynich, E. L. (1988). Chopin's letters. Dover.

Chicago Style (17th ed.) Citation

Chopin, Frédéric, Henryk Opieński, and E. L. Voynich. Chopin's Letters. New York: Dover, 1988.

MLA (9th ed.) Citation

Chopin, Frédéric, et al. Chopin's Letters. Dover, 1988.