Meißner, Birgit; Doktor, Anke (2000). "Galvanoplastik – Geschichte einer Technik aus dem 19. Jahrhundert" [Galvanoplastik – History of a Technology from the 19th Century]. In Meißner, Birgit; Doktor, Anke; Mach, Martin (eds.). Bronze- und Galvanoplastik: Geschichte – Materialanalyse – Restaurierung(PDF) (in German). Landesamt für Denkmalpflege Sachsen. p.129.
WMF, letter to Mr. Albert Weiblen, Antwerp. "Artistic merits of our reproduction of the famous 'Doors of Paradise'", 14 August 1928. Albert Weiblen Marble & Granite Works Office Records, The Southeastern Architectural ArchiveArchived 22 March 2019 at the Wayback Machine, Special Collections Division, Tulane University Libraries.
WMF, letter to Mr. Albert Weiblen, Antwerp. "Artistic merits of our reproduction of the famous 'Doors of Paradise'", 14 August 1928. Albert Weiblen Marble & Granite Works Office Records, The Southeastern Architectural ArchiveArchived 22 March 2019 at the Wayback Machine, Special Collections Division, Tulane University Libraries.