| Kilder |
- [S94] Dypvåg klokkerbok B 13 1887 - 1900. Dypvåg sokn, Dypvåg prgj, Aust-Agder, Levende fødte 1891. Side 48 - nr. 13. Marta Petra. (Troverdighet: 3).
- [S46] Ancestry.com, U.S., Evangelical Lutheran Church in America Church Records, 1781-1969 [database on-line]. Lehi, Utah, USA: Ancestry.com Operations, Inc., 2015. (Troverdighet: 3).
- [S238] Find a grave, (USA), Memorial page for Martha Petra Olsen Tellefsen (7 May 1891–2 Jul 1983), Find a Grave Memorial ID 224693543, citing Pinelawn Memorial Park and Arboretum, East Farmingdale, Suffolk County, New York, USA; Maintained by Anonymous (contributor 47533540). (Troverdighet: 3).
https://www.findagrave.com/memorial/224693543/martha-petra-tellefsen
- [S48] Dypvåg klokkerbok B 12 1872 - 1886. Dypvåg sokn, Dypvåg prgj, Aust-Agder, Ægteviede 1872. Side 516-517 - nr. 2. Ungkarl og skibstømmermand Laurits Olsen og Pige Amalie Lovise Jensdatter. (Troverdighet: 3).
- [S46] Ancestry.com, New York, New York, U.S., Extracted Marriage Index, 1866-1937 [database on-line]. Provo, Utah, USA: Ancestry.com Operations, Inc., 2014. Certificate Number: 8022 (Troverdighet: 3).
- [S82] Folketelling USA 05.01.1920, Census Place: Brooklyn Assembly District 3, Kings, New York; Roll: T625_1148; Page: 10A; Enumeration District: 145 (Troverdighet: 3).
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