| Kilder |
- [S2] Tvedestrand ministerialbok A 01 1885 - 1916. Tvedestrand sokn, Tvedestrand prgj, Aust-Agder, Levende fødte 1911. Side 102 - nr. 5. Elna Johanne. (Troverdighet: 3).
- [S238] Find a grave, (USA), Memorial page for Elna Johanne Markstrom Balchen (20 Dec 1910–Oct 1973), Find a Grave Memorial ID 162408696, citing Flower Hill Cemetery and Mausoleum, North Bergen, Hudson County, New Jersey, USA; Maintained by Rich K (contributor 47313716). (Troverdighet: 3).
https://www.findagrave.com/memorial/162408696/elna_johanne-balchen
- [S46] Ancestry.com, New Jersey State Archives; Trenton, New Jersey; Marriage Indexes; Indextyp: Bride; Årtalsintervall: 1910-1914; Efternamnsintervall: R - S (Troverdighet: 3).
- [S241] Folketelling USA 01.04.1940, Folkräkningsplats: New York, Richmond, New York; Rulle: m-t0627-02761; Sida: 6B; Räkningsdistrikt:: 43-59 (Troverdighet: 3).
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