bibliography :: Cranach Digital Archive https://lucascranach.org/index.php/Home/luther/bibliography
Enders, Ernst Ludwig (Hg.) (1896/1900/1902): Johann
Enders, Ernst Ludwig (Hg.) (1896/1900/1902): Johann
Kritischer Katalog der Luther-Bildnisse (1519-1530)
Enders, Ernst Ludwig (Hg.) (1896/1900/1902): Johann