| Kilder |
- [S48] Dypvåg klokkerbok B 12 1872 - 1886. Dypvåg sokn, Dypvåg prgj, Aust-Agder, Døbte 1875. Side 82-83 - nr. 86. Marthe Halvarda. (Troverdighet: 3).
- [S94] Dypvåg klokkerbok B 13 1887 - 1900. Dypvåg sokn, Dypvåg prgj, Aust-Agder, Konfirmerede 1890. Side 149 - nr. 17. Marte Halvarda Knudsen. (Troverdighet: 3).
- [S599] "Emigranter over Kristiansand 1873 - 1930.", https://www.digitalarkivet.no/pe00000000312808 (Troverdighet: 3).
- [S477] Ancestry, New York, U.S. Arriving Passenger and Crew Lists, Passenger and Crew Lists of Vessels Arriving at New York, New York, 1897-1957; Mikrofilmsserienummer eller NAID: T715; RG-rubrik: Records of the Immigration and Naturalization Service, 1787-2004; RG: 85 (Troverdighet: 3).
- [S238] Find a grave, (USA), Memorial page for Halvarda Bertelsen (unknown–29 Jan 1957), Find a Grave Memorial ID 118899291, citing The Evergreens Cemetery, Brooklyn, Kings County, New York, USA; Maintained by Athanatos (contributor 46907585). (Troverdighet: 3).
https://www.findagrave.com/memorial/118899291/halvarda-bertelsen
- [S46] Ancestry.com, U.S., Evangelical Lutheran Church in America Church Records, 1781-1969 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2015. (Troverdighet: 3).
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