[Various keyboard pieces]

MLA

Schmidt, et al. [various Keyboard Pieces]. s.l, .d.

APA

Schmidt, S., Strauss, J., Wiegant, J., Rossini, G., Bellini, V., Mozart, W. Amadeus, Grisar, A., & Donizetti, G. (.d). [Various keyboard pieces]. s.l.

Chicago

Schmidt, Johann Strauss, John Wiegant, Gioacchino Rossini, Vincenzo Bellini, Wolfgang Amadeus Mozart, Albert Grisar, and Gaetano Donizetti. [various Keyboard Pieces]. s.l, .d.