Cita APA (7th ed.)

Mark, K. (1993). Valved Friends: For two trumpets and band / Koos Mark (Full score, condensed score.). Molenaar.

Cita Chicago (17th ed.)

Mark, Koos. Valved Friends: For Two Trumpets and Band / Koos Mark. Full score, condensed score. Wormerveer, Holland: Molenaar, 1993.

Cita MLA (8th ed.)

Mark, Koos. Valved Friends: For Two Trumpets and Band / Koos Mark. Full score, condensed score. Molenaar, 1993.