"Illinois, Cook County, Birth Certificates, 1871-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q239-42V5 : 18 May 2016), John Loerop in entry for Frederick John Loerop, 20 Apr 1915; Chicago, Cook, Illinois, United States, reference/certificate 225541, Cook County Clerk, Cook County Courthouse, Chicago; FHL microfilm .