List of sources:
Brain, C.K. The status of rotifer research in southern Africa with an account of Charles F. Rousselet's early explorations. Transvaal Museum Bulletin, 1987, No. 22, pp. 13-20.
FamilySearch: Thomas Kirkman. https://www.familysearch.org/tree/person/details/MLD4-HTX AND https://www.familysearch.org/ark:/61903/3:1:3Q9M-C91X-P9H8-V?view=index&personArk=/ark:/61903/1:1:QG6P-HWG2&action=view&cc=2721608
Natal who's who. Durban, 1906.
South African Association for the Advancement of Science. Report, 1905/6, 1910: Lists of members.
South African who's who, 1908, 1917/8, 1919/20.
Warren, E. On Bertramia kirkmani, sp. n., a Myxosporidium occurring in a South African rotifer. Annals of the Natal Museum, 1906, Vol. 1, pp. 7-18.
Who was who, Vol. 2, 4th ed. London: Adam & Black, 1967.
Wills, W.H. The Anglo-African who's who and biographical sketch book. London: Upcott, 1910.