From: Witklip
This Prisoner of War record for Wilhelm Schalk J V J Van Vuuren 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=2065&r=Wilhelm Schalk J V J&s=Van Vuuren&ref=
This set of Prisoner of War documents can be accessed online via the FamilySearch.org project by Clicking Here.