Letter dated 29.9.1833 og 28.6.1834 from H.W. Bissen to J.M. Thiele. Manuscript Department, The Royal Library, Copenhagen, NKS 1540 2°. (See: Haavard Rostrup, Billedhuggeren H.W. Bissen 1798-1868, Copenhagen 1945, Part 1, p. 129-133).
Letters of 27.7.1833 and 6.6.1834 from D.C. Blunck to J.L. Lund. Manuscript Department, The Royal Library, Copenhagen, NBD. (See: Haarvard Rostrup, Billedhuggeren H.W. Bissen 1798-1868 Copenhagen 1945, Part 1, p. 133-135).