Widmoser, J. (1992). Modern String Quartet: Four Brothers. MOOD-Records.
Cita Chicago (17th ed.)Widmoser, Jörg. Modern String Quartet: Four Brothers. Heidelberg: MOOD-Records, 1992.
Cita MLA (8th ed.)Widmoser, Jörg. Modern String Quartet: Four Brothers. MOOD-Records, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.