From: Waterval
This Prisoner of War record for Adrian Jacobus Jeremias Greeff was transcribed record from various documents held at the National Archives, South Africa, including arrest and shipping information from newspaper sources like De Zuid-Afrikaan.
https://www.gendatabase.com/boer-war-prisoner-record.php?q=13743&r=Adrian Jacobus Jeremias&s=Greeff&ref=
This set of Prisoner of War documents can be accessed online via the FamilySearch.org project by Clicking Here.