APA (7th ed.) Citation

Schumann, R., De Lara, A., & Ferber, A. (1991). Pupils of Clara Schumann. Pearl.

Chicago Style (17th ed.) Citation

Schumann, Robert, Adelina De Lara, and Albert Ferber. Pupils of Clara Schumann. Wadhurst, E. Sussex, England: Pearl, 1991.

MLA (9th ed.) Citation

Schumann, Robert, et al. Pupils of Clara Schumann. Pearl, 1991.