"Illinois, Cook County Marriages, 1871–1920," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q21V-G1HK (页面存档备份,存于互联网档案馆) : 28 November 2018), John Gacy and Marion E Robertson, 07 Jan 1939, citing Cook County Clerk. Cook County Courthouse, Chicago; FHL microfilm 102504570.
web.archive.org
John Wayne Gacy Biography. Biography.Com WebSite. A&E Television Networks. February 11, 2019 [April 2, 2014] [April 5, 2019]. (原始内容存档于2020-05-22).
"Illinois, Cook County Marriages, 1871–1920," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q21V-G1HK (页面存档备份,存于互联网档案馆) : 28 November 2018), John Gacy and Marion E Robertson, 07 Jan 1939, citing Cook County Clerk. Cook County Courthouse, Chicago; FHL microfilm 102504570.
John Wayne Gacy Biography. Biography.com. A&E Television Networks. February 11, 2019 [April 2, 2014] [April 5, 2019]. (原始内容存档于May 22, 2020).