List of sources:
Cape of Good Hope Government Gazette, 9 January 1885, pp. 44-45: List of licensed chemists and druggists in the Cape Colony.
FamilySearch: George Estill Cooke. https://www.familysearch.org/ark:/61903/1:1:QLGR-ZD9Q
Grahamstown Journal, 22 June 1885, p. 3: Pharmaceutical Association.
Kaffrarian Watchman, 17 June 1885, p. 3; 22 July 1885, p. 3: South African Pharmaceutical Association.
King William's Town Naturalist's Society. Minute Book, 23 December 1885.
Medical and Pharmacy Register for the Colony of the Cape of Good Hope. Cape Town: W.A. Richards & Sons, 1893.
Medical, dental and pharmacy directory of South Africa, 1926-1927.
Men of the times: Old colonists of the Cape Colony and Orange River Colony. Johannesburg: Transvaal Publishing Co., 1906.
Pietermaritzburg Archives Repository, Vol. NMC 34, [list of medical practitioners, dentists, and chemists and druggists in the Province of the Cape of Good Hope, as on 31 December 1915].
Randles, B.M. A history of the Kaffrarian Museum (p. 2-3). King William's Town: The Kaffrarian Museum, 1984.
Rootsweb: South Africa
Eastern Cape L Archives. Retrieved from http://archiver.rootsweb.ancestry.com/th/read/SOUTH-AFRICA-EASTERN-CAPE/2007-05/1178544584
on 25 April 2016.
Ryan, M. A history of organised pharmacy in South Africa, 1885-1950. Cape Town: The Society for the History of Pharmacy in South Africa, 1986.