List of sources:
1820 Settler Genealogies, at http://www.1820settlers.com/genealogy/index.php Search for Hutton, Henry.
Cape of Good Hope. Report of the committee of the Albany Museum, 1891, 1894, 1895.
Cape of Good Hope. Civil service list, 1887.
FamilySearch: Henry Hutton. https://ancestors.familysearch.org/en/LRKR-Q27/henry-hutton-1825-1896
Grahamstown Journal, 15 March 1856, p. 2, "Literary, Scientific and Medical Society"; 11 October 1867, p. 3, "Albany Natural History Society" (lecture by P. MacOwan).
Grahamstown Philomatic Society. Minute Book, 15 February 1849, list of members. (Bowker Collection, Albany Museum).
Gunn, M. & Codd, L.E. Botanical exploration of southern Africa. Cape Town: Balkema, 1981.
Harvey, W.H. & Sonder, O.W. Flora Capensis, being a systematic description of the plants of the Cape Colony, Caffraria, and Port Natal (Vol. 1). Ashford, Kent: Lovell Reeve, 1894 (originally published 1860).
MacOwan, P. Personalia of botanical collectors at the Cape. Transactions of the South African Philosophical Society, 1886, Vol. 4, pp. xxx-liii.
Malherbe, D.F. du T. Family register of the South African nation (3rd ed.) Stellenbosch: Tegniek, 1966.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Henry Hutton.
South African Agricultural Register and Eastern Province Magazine, 14 July 1859, No. 39, pp. 482-483, "Albany Agricultural Society".