List of sources:
Medical, dental and pharmacy register for the Transvaal, 1907.
National Archives Repository (TAB), Source MHG, Vol. 0, Ref. 10855: death notice, James Ward Summerhayes.
Obituary: James Ward Summerhayes, MD (Durh.), MRCS, LRCP. South African Medical Record, 1907, Vol. 5. p. 252.
South African Medical Record, Vol. 3, 1905, paper by Summerhayes.