APA (7th ed.) Citation

Schumann, R. A., & Schumann, C. (1994). Selected masterpieces for piano. G. Schirmer.

Chicago Style (17th ed.) Citation

Schumann, Robert Alexander, and Clara Schumann. Selected Masterpieces for Piano. New York: G. Schirmer, 1994.

MLA (9th ed.) Citation

Schumann, Robert Alexander, and Clara Schumann. Selected Masterpieces for Piano. G. Schirmer, 1994.