List of sources:
Herbert Marie Hubert Von Pelser Berensberg. FamilySearch. https://www.familysearch.org/ark:/61903/1:1:6ZH5-C2HJ
Lounsbury, C.P. The pioneer period of economic entomology in South Africa. Journal of the Entomological Society of South Africa, 1940, Vol. 3, pp. 9-29.
Natal [Colony]. Report of the Government Entomologist, 1905/6, 1909/10.
Natal Agricultural Journal, 1905-1907, Vol. 8-10, articles by Berensberg; 1908, Vol. 11, p. 184, "Mr H. von P. Berensberg".
Natal civil service list, 1906, 1907.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to H von Pelser Berensberg / H von P Berensberg.
South African bibliography to the year 1925, Vol. 5. Cape Town: South African Library, 1991.