List of sources:
Cape of Good Hope. Report of the trustees of the South African Museum, 1905.
FamilySearch: Edward Charles Long. https://www.familysearch.org/en/tree/person/details/GRY9-WWQ
General directory of South Africa, 1903, 1908, 1909.
Geological Society of South Africa. Transactions, 1906, Vol. 10, list of members.
Google scholar. http://scholar.google.co.za Publications by E.C. Long.
Medical and Pharmacy Register for the Colony of the Cape of Good Hope, 1907.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Long, E.C. / Dr Long.
Pietermaritzburg Archives Repository, Vol. NMC 34: [List of medical practitioners, etc., registered in the Province of the Cape of Good Hope, as on 31 December 1915; List of medical practitioners, etc., registered in the Province of the Orange Free State, as on 31 December 1916].
South African Association for the Advancement of Science. Report, 1910, list of members.
South African medical directory for 1897. Cape Town: Cape Times, 1897.
South African Medical Journal (Second series), July 1896- October 1897, Vol. 4, Notes section; May 1897, Vol. 5, pp. 20-21 and January 1898, Vol. 5, pp. 240-242, South African Medical Association (list of members).
South African Medical Record, 1916, Vol. 14, paper by Long.
South African Philosophical Society. Transactions, 1906, Vol. 16, list of members.
Transcribed marriages for Long. Retrieved
from http://www.1820settlers.com/genealogy/settlerbrowsemarrs.php?name=LONG
on 2018-6-6.
University of the Cape of Good Hope. Calendar, 1884/5.
Who was who, Vol. 3, 2nd ed. London: Adam & Black, 1967.