From: Elandsfontein
This Prisoner of War record for Arie Van Der Kooi 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=10928&r=Arie&s=Van Der Kooi&ref=
This set of Prisoner of War documents can be accessed online via the FamilySearch.org project by Clicking Here.