Th-B, "Widnmann, Max von, sculptor", Dictionary of German Biography, ed. Walther Killy and Rudolf Vierhaus, with Dietrich von Engelhardt et al., Volume 10 Thibaut – Zycha, Munich: Saur, 2006, ISBN9783598233005, p. 498.
"Widnmann, Max", Friedrich Mueller, Die Künstler aller Zeiten und Völker oder, Leben und Werke der berühmtesten Baumeister, Bildhauer, Maler, Kupferstecher, etc., Volume 3, Stuttgart: Ebner & Seubert, 1864, OCLC680290293, p. 865(in German)
"Giesskunst", J.A. Romberg and Friedrich Faber, Conversations-Lexicon für bildende Kunst, volume 3, Leipzig: Romberg, 1850, OCLC1443119, p. 74(in German)
Wilhelm Lübke, tr. F.E. Bunnett, History of Sculpture: From the Earliest Ages to the Present Time, London: Smith, Elder, 1872, OCLC2274613, Volume 2, p. 465.
"Widnmann, Max", Friedrich Mueller, Die Künstler aller Zeiten und Völker oder, Leben und Werke der berühmtesten Baumeister, Bildhauer, Maler, Kupferstecher, etc., Volume 3, Stuttgart: Ebner & Seubert, 1864, OCLC680290293, p. 865(in German)
"Giesskunst", J.A. Romberg and Friedrich Faber, Conversations-Lexicon für bildende Kunst, volume 3, Leipzig: Romberg, 1850, OCLC1443119, p. 74(in German)
Wilhelm Lübke, tr. F.E. Bunnett, History of Sculpture: From the Earliest Ages to the Present Time, London: Smith, Elder, 1872, OCLC2274613, Volume 2, p. 465.