List of sources:
Durban Botanic Society. Report, Natal Botanic Gardens, 1897. (Don Africana Library, Durban.)
FamilySearch: Herbert Harding Cruickshank Puntan. https://ancestors.familysearch.org/en/LBMG-G48/herbert-harding-cruickshank-puntan-1860-1940 AND https://www.familysearch.org/ark:/61903/3:1:3QHV-J3DQ-K931-V?view=index&personArk=/ark:/61903/1:1:6N8B-7RPD&action=view&cc=3511741&lang=en&groupId=
General directory of South Africa, 1903, 1908, 1911, 1916: Directory of Durban.
Natal almanac, directory and yearly register, 1898, 1899: Durban Botanic Society; 1900, pp. 609-610: Chemists and druggists admitted to practice in the Colony of Natal.
Natal who's who, 1906.
National Automated Archival Information Retrieval System (NAAIRS). http://national.archives.gov.za/naairs.htm Documents relating to Puntan, Herbert Harding Cruickshank / Puntan, H.H.C.
The Naturalist (Durban), 1911, Vol. 1, Numbers 3, 5 and 6: Council of the Natal Scientific Society.
South African Association for the Advancement of Science. Report, 1907.
South African Chemical Institute. Proceedings and list of members, 1921-1922.