"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K9DW-959 : accessed 17 Jul 2014), Joseph Cohen, Assembly District 27, San Francisco, San Francisco City, San Francisco, California, United States; citing enumeration district (ED) 38-507, sheet 12A, family 281, NARA digital publication of T627, roll 318.