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- [S56] Boonstra Committee, Boonstra Genealogie, (Drukkerij de Jong, Grou, September 2000), Fam. 39, p. 129, Gen. IVa-2.
- [S141] Dr. T.A. Romein, Friesland Pred, (Leeuwarden, 1886), Vol. 2, p. 385.
- [S141] Dr. T.A. Romein, Friesland Pred, (Leeuwarden, 1886), Vol. 2, p. 473.
- [S56] Boonstra Committee, Boonstra Genealogie, (Drukkerij de Jong, Grou, September 2000), Fam. 39, p. 128,129, Gen. III-1,IVa.
- [S56] Boonstra Committee, Boonstra Genealogie, (Drukkerij de Jong, Grou, September 2000), Fam. 39, p. 129 IVa-2.
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