"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KH3W-DWS : accessed 24 May 2013), Frank Bergsma, Ward 3, Grand Rapids, Grand Rapids City, Kent, Michigan, United States; citing enumeration district (ED) 86-131, sheet 1A, family 1, NARA digital publication T627, roll 1901.