List of sources:
Barnard, K.H. Personal names in South African conchology. Cape Town: Conchological Society of Southern Africa, 1965.
Bull, E. Aided immigration from Britain to South Africa, 1857 to 1867. Pretoria: Human Sciences Research Council, 1991.
Cape of Good Hope. Report on the Port Elizabeth Museum, 1888.
Eastern Province Naturalists' Society. Ninth Annual Report... for the year 1890. Port Elizabeth: J. Kemsley, 1891. (Port Elizabeth Public Library, Africana Collection).
Eastern Province Naturalists' Society. Minute Book (1882-1885), 83rd meeting, 24 April 1885; (1885-1892), 127th meeting, 14 January 1887, and list of members.
FamilySearch: Edward John Langley. https://www.familysearch.org/en/tree/person/details/MSB7-MV3
Kilburn, R. & Rippey, E. Sea shells of southern Africa. Johannesburg: Macmillan, 1982.