"New York, Passenger Arrival Lists (Ellis Island), 1892-1924," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JNVL-J6L : accessed 1 August 2015), Sietse Reuse Deursen, 05 Dec 1922; citing departure port Liverpool, England, arrival port New York, ship name Tyrrhenia, NARA microfilm publication T715 and M237 (Washington D.C.: National Archives and Records Administration, n.d.).
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J57Z-HMW : accessed 1 August 2015), Richard Deursen, Aug 1984; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KSJ1-QVZ : accessed 1 August 2015), Marie G Deursen in household of Richard Deursen, Tamarack, Tamarack Village, Aitkin, Minnesota, United States; citing enumeration district (ED) 1-41, sheet 2A, family 27, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1903.
