List of sources:
Ancestry.com, at http://records.ancestry.com Search for Pieter Joseph Dormehl.
Cape of Good Hope. Civil Service List, 1896, 1910.
ESPN scrum, at http://www.espnscrum.com Search for Pieter Dormehl.
FamilySearch: Pieter Joseph Dormehl. https://www.familysearch.org/ark:/61903/3:1:3Q9M-C91P-J9DJ-F?view=index&personArk=/ark:/61903/1:1:6ZSX-8H7Z&action=view and https://www.familysearch.org/ark:/61903/1:1:6ZH5-7XJL
Keet, J.D.M. Historical review of the development of forestry in South Africa. Undated manuscript, c. 1972. Electronic copy received from Forestry Scientific/Technical Services, Knysna.
National Automated Archival Information Retrieval System (NAAIRS), at http://www.national.archives.gov.za/naairs.htm Documents relating to P.J. Dormehl / Pieter Joseph Dormehl.
Union of South Africa. Public Service List, 1914. Pretoria: Government Printer, 1914.