↑ 1.01.1Scanned Norwegian Church records at Digitalarkivet. Bamble parish, Telemark. SAKO/A-253/F/Fa/L0002: Parish register (official) no. I 2, 1775-1814. Births and Christenings page 96-97. 20 Feb 1791: Hans Thomas Sebiørnsen og hustrue Gierthrud Pedersdatters barn kaldet Niels. Faddere: Berthel Andersens kone Helge Pedersdatter, pige Dorthe Lispeth Pedersdatter, Henrich Pedersen, Niels Jensen Høg, Hans Jacobsen Ancher.
↑Scanned Norwegian Census records at Digitalarkivet. Year 1801 census. Bamble parish, Telemark. RA/EA-4070/J/Jd/L0028 page 92b-93a. "Langesund" (forts.) Household no. 32: Skipstømmermann Hans Thomes Sigbiørnsen.
↑Scanned Norwegian Church records at Digitalarkivet. Bamble parish, Telemark. SAKO/A-253/F/Fa/L0002: Parish register (official) no. I 2, 1775-1814. Confirmations page 350-351. 3 May 1807 11. Niels Hansen Langesund, døbt 20 Feb 1791.