Birth record of Michelle Obama's mother, Marian Lois Shields : "Illinois, Cook County, Birth Certificates, 1871-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QL9S-D3TQ : 27 March 2017), Marian Lois Shields, 29 Jul 1937; Cook, Illinois, United States, reference/certificate 27398, Cook County Clerk, Cook County Courthouse, Chicago; FHL microfilm .