Vlak, K. (1992). Quatro variazioni musicali: Con tema populare ; for band / Kees Vlak (Condensed score.). Molenaar.
Cita Chicago (17th ed.)Vlak, Kees. Quatro Variazioni Musicali: Con Tema Populare ; for Band / Kees Vlak. Condensed score. Wormerveer, Holland: Molenaar, 1992.
Cita MLA (8th ed.)Vlak, Kees. Quatro Variazioni Musicali: Con Tema Populare ; for Band / Kees Vlak. Condensed score. Molenaar, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.