Mark, K. (1993). Valved Friends: For two trumpets and band / Koos Mark (Full score, condensed score.). Molenaar.
Lua i Stíl Chicago (17ú heag.)Mark, Koos. Valved Friends: For Two Trumpets and Band / Koos Mark. Full score, condensed score. Wormerveer, Holland: Molenaar, 1993.
Lua MLA (8ú heag.)Mark, Koos. Valved Friends: For Two Trumpets and Band / Koos Mark. Full score, condensed score. Molenaar, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.