↑Scanned Norwegian Church records at Digitalarkivet. Gjerpen parish, Telemark. SAKO/A-265/F/Fa/L0003: Parish register (official) no. 3, 1796-1814. Births and Christenings page 38. 10 Nov 1811: Erich Matthiæsøns hjemmedøbte drengebarn Østen under Gulset, født 9de Oct. Faddere: Niels Strømdals kone, Karen Dorothea Matthiædatter, Niels Strømdal, Stian Pederssøn, Rejer Matthiæsøn.
↑Scanned Norwegian Church records at Digitalarkivet. Solum parish, Telemark. SAKO/A-306/F/Fa/L0004: Parish register (official) no. I 4, 1814-1833. Confirmations page 265. 5 Oct 1828 30. Østen Eriksen Grøtsund, husbond Abraham Jensen, 10 Nov 1811 Gjerpen.
↑Scanned Norwegian Church records at Digitalarkivet. Solum parish, Telemark. SAKO/A-306/F/Fa/L0004: Parish register (official) no. I 4, 1814-1833. Weddings page 218. 25 Sep 1833: Østen Eriksen u. Grødsund Ungk. 22 aar og Gunild Evensdatter sammesteds Pige 28 aar. Forlovere Hans Jacobsen Aafos og Las Andersen Grødsund.