Bertel Thorvaldsen with the Statue of Hope, Nysø36, preparatory model for Nysø1.
Rigmor Stampe (ed.): Baronesse Stampes Erindringer om Thorvaldsen, Copenhagen 1912, p. 15-16.
Thiele IV, p. 72-73. Thiele writes that the portrait statue was not begun until after his return from Sweden, that is at the end of July 1839. As a first-hand source Stampe should here be regarded as more reliable than Thiele.