"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K971-SDJ : accessed 23 May 2014), Edward C Spoestra in household of John E Spoestra, Tract 443, Sierra Madre, Monrovia Judicial Township, Los Angeles, California, United States; citing enumeration district (ED) 19-381, sheet 2A, family 35, NARA digital publication of T627, roll 237.