"New York, Passenger Arrival Lists (Ellis Island), 1892-1924," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/JXJH-XPV : accessed 03 Oct 2014), Pier Wykstra, arrived at New York, 29 May 1907, on the Statendam; citing National Archives, Washington D.C.