APA (7th ed.) Citation

Chopin, F. (1950). Twelve etudes, op. 10 ; Twelve etudes, op. 25 ; Three etudes, op. posth. Lea Pocket Scores.

Chicago Style (17th ed.) Citation

Chopin, Frédéric. Twelve Etudes, Op. 10 ; Twelve Etudes, Op. 25 ; Three Etudes, Op. Posth. New York: Lea Pocket Scores, 1950.

MLA (9th ed.) Citation

Chopin, Frédéric. Twelve Etudes, Op. 10 ; Twelve Etudes, Op. 25 ; Three Etudes, Op. Posth. Lea Pocket Scores, 1950.