| Kilder |
- [S172] Eigersund klokkerbok B 11 1908 - 1930. Eigersund landesokn, Eigersund prgj, Rogaland, Levende fødte 1928. Side 94 - nr. 31. Per Tønnessen. (Troverdighet: 3).
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- [S404] Eigersund ministerialbok A 20 1906 - 1928. Eigersund landesokn, Eigersund prgj, Rogaland, I Ægteskab Indtraadte 1927. Side 170 - nr. 3. Peder Konrad Næss Tønnessen og Hanna Bertiniussen Svindland- (Troverdighet: 3).
- [S46] Ancestry.com, New York State Department of Health; Albany, NY, USA; New York State Marriage Index Source Information Ancestry.com. New York State, Marriage Index, 1881-1967 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2017. (Troverdighet: 3).
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