| Kilder |
- [S1264] Sør-Audnedal klokkerbok B 02 1853 - 1878. Spangereid sokn, Sør-Audnedal prgj, Vest-Agder, Døbte 1872. Side 88 - nr. 1. Rikardt. (Troverdighet: 3).
- [S46] Ancestry.com, U.S., Social Security Applications and Claims Index, 1936-2007 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2015. (Troverdighet: 3).
- [S2] Tvedestrand ministerialbok A 01 1885 - 1916. Tvedestrand sokn, Tvedestrand prgj, Aust-Agder, I Ægteskab Indtraadte 1899. Side 209 - nr. 5. Rikard Pettersen Njerve og Hagny Eskildsen. (Troverdighet: 3).
- [S22] Tvedestrandsposten, Tvedestrand, Aust-Agder, 21.12.1960 (Troverdighet: 3).
- [S124] Folketelling USA 01.04.1950 (Troverdighet: 3).
Seventeenth Census of the United States, 1950; Record Group: Records of the Bureau of the Census, 1790-2007; Record Group Number: 29; Residence Date: 1950; Home in 1950: Huntington, Suffolk, New York; Roll: 5884; Sheet Number: 72; Enumeration District: 52-161A
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