"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KH3S-D5P : accessed 31 May 2013), Gerrit Rinzema, Ward 1, Grand Rapids, Grand Rapids City, Kent, Michigan, United States; citing enumeration district (ED) 86-22, sheet 6B, family 121, NARA digital publication T627, roll 1897.