| Sources |
- [S20] Information from Ethne Hall.
- [S1441] Marriage Banns: Theodorus Hermanus de Koker and Esther Kronstrom, (South Africa, Dutch Reformed Church Registers (Cape Town Archives), 1660-1970 ", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:6KC1-XDS6 : Sun Mar 10 15:41:53 UTC 2024), Entry for Theodorus Hermanus De Koker and Esther Kronström, 3 May 1952.).
- [S1442] Marriage Theodorus Hermanus de Koker and Esther Kronstrom, (South Africa, Civil Marriage Records, 1840-1973", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:6ZC9-KLTD : Thu Mar 07 18:09:13 UTC 2024), Entry for Theodorus Hermanus Dekoker and Esther Kroonstrom, 3 May 1952.).
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