APA (7th ed.) Citation

Sassmannshaus, E., & Sassmannshaus, K. (2010). Early start on the Viola. Barenreiter.

Chicago Style (17th ed.) Citation

Sassmannshaus, Egon, and Kurt Sassmannshaus. Early Start on the Viola. Kassel: Barenreiter, 2010.

MLA (9th ed.) Citation

Sassmannshaus, Egon, and Kurt Sassmannshaus. Early Start on the Viola. Barenreiter, 2010.