| Sources |
- [S17] Marena van Hemert, Ou Swellendam Families Deel 3, (M. van Hemert, Linden, Johannesburg, 2006. ISBN 0-620-31296-7).
- [S57] de Villiers, C.C., revised by Pama, C., Genealogies of Old South African Families, (Published A.A Balkema, Cape Town, 1981 ISBN 0-86961-136-4), Entry for van Zyl (Reliability: 3).
- [S1416] South Africa, Orange Free State, Civil Death Registration, 1902-1954, (familysearch.org), 1915 Death Adriaan Izak van Zyl (Reliability: 3).
- [S978] South Africa, Cape Province, Probate Records of the Master of the High Court, 1834-1989, (accessed at familysearch.org), 1889 Death Johannes Wilhelm van Zyl (unindexed) (Reliability: 3).
- [S1037] South Africa, Cape Province, Kimberley, Probate Records of the Supreme Court, 1871-1937, ("South Africa, Cape Province, Kimberley, Probate Records of the Supreme Court, 1871-1937," database with images, FamilySearch (https://familysearch.org), 1881 Death Notice Geertrui Anna Geldenhuijs (Reliability: 3).
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