Neumann, O. (1991). Joseph Smalkowski alias Copernicus. artist : Kunstmagazin.
Cita Chicago (17th ed.)Neumann, Olaf. "Joseph Smalkowski Alias Copernicus." Artist : Kunstmagazin 1991.
Cita MLA (8th ed.)Neumann, Olaf. "Joseph Smalkowski Alias Copernicus." Artist : Kunstmagazin, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.