Büsing, N., & Klaas, H. (2004). Klaus Hartmann. artist : Kunstmagazin.
Cita Chicago (17th ed.)Büsing, Nicole, i Heiko Klaas. "Klaus Hartmann." Artist : Kunstmagazin 2004.
Cita MLA (8th ed.)Büsing, Nicole, i Heiko Klaas. "Klaus Hartmann." Artist : Kunstmagazin, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.