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- [S56] Boonstra Committee, Boonstra Genealogie, (Drukkerij de Jong, Grou, September 2000), Boonstra Fam. 14, p. 66 IIIf-8, 68 IVm.
- [S56] Boonstra Committee, Boonstra Genealogie, (Drukkerij de Jong, Grou, September 2000), Boonstra Fam. 14, p. 66 IIIf-8, 66b IVm.
- [S56] Boonstra Committee, Boonstra Genealogie, (Drukkerij de Jong, Grou, September 2000), Fam. 14, p. 66 IIIf.
- [S56] Boonstra Committee, Boonstra Genealogie, (Drukkerij de Jong, Grou, September 2000), Fam. 14, p. 66b IVm.
- [S56] Boonstra Committee, Boonstra Genealogie, (Drukkerij de Jong, Grou, September 2000), Fam. 14, p. 66 IIIf-8, 66b IVm.
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