"New York Passenger Arrival Lists (Ellis Island), 1892-1924," database with images, FamilySearch (https://familysearch.org/ark:/61903/3:1:3Q9M-C9TF-GL7Z?cc=1368704&wc=4XBX-353%3A1600472589 : 23 February 2018), Roll 2549, vol 5960-5962, 22 Oct 1917 > image 984 of 1061; citing NARA microfilm publication T715 and M237 (Washington D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KH92-H1P : 15 March 2018), Peter J Helfenstein, Ward 15, Detroit, Detroit City, Wayne, Michigan, United States; citing enumeration district (ED) 84-863, sheet 63A, line 29, family 48, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1865.
"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2475-R64 : 10 February 2018), Peter Helfenstein and Rosa Felber, 09 Jun 1920; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,643,839.
Helfenstein, Dr. Alfred, Der Neuenkircher Zweig, "Die Helfenstein, Geshictlicher un genealogischer Aufriss der helfensteinischen Stämme, Sippen, Zweige, und Familien mit 24 Ahnenstafeln und 63 Illustrationen", seite 179-182, Buchdrucherei Wallimann, Beromünster. Buchbindeerei: An der Reuss, Luzern (1972).
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