APA (7th ed.) Citation

Beethoven, L. v., Simandl, F., & Sankey, S. (1976). Romance opus 50 for string bass and piano. International Music.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van, Franz Simandl, and Stuart Sankey. Romance Opus 50 for String Bass and Piano. New York: International Music, 1976.

MLA (9th ed.) Citation

Beethoven, Ludwig van, et al. Romance Opus 50 for String Bass and Piano. International Music, 1976.