"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XSLJ-MP5 : accessed 26 Sep 2014), Abel Schoonveld Sr., Chicago (Districts 0501-0750), Cook, Illinois, United States; citing enumeration district (ED) 0572, sheet 24A, family 124, NARA microfilm publication T626, roll 440.