Rigmor Stampe (ed.): Baronesse Stampes Erindringer om Thorvaldsen, Copenhagen 1912, p. 47 (mentions that the cross was forwarded from Copenhagen; the exact date is not mentioned, and Stampe claims that Thorvaldsen was awarded the title of Commander of the Order of Dannebrog – a title, which he had already been awarded 1.8.1829).
Carl Frederik Wilckens: Træk af Thorvaldsens Konstner- og omgangsliv, samlede til Familielæsning, Copenhagen 1874, p. 20-22 (relates that the king forwarded an extra Grand Cross to Thorvaldsen’s Copenhagen home in case he should appear there on the 19.11.1839).
Thiele IV, p. 104.
Per Thornit: “Tegn paa udvortes Erkjendelse”… Bertel Thorvaldsen og H.C. Andersens ordener, [Copenhagen] 1979, p. 25-28.