Blume, E. Berlin international: Eugen Blume. Textbuch.(2004).
Cita Chicago (17th ed.)Blume, Eugen. "Berlin International: Eugen Blume." Textbuch.(2004) .
Cita MLA (8th ed.)Blume, Eugen. "Berlin International: Eugen Blume." Textbuch.(2004), .
Atenció: Aquestes cites poden no estar 100% correctes.