"William Haade". Internet Broadway Database. The Broadway League. Archived from the original on December 27, 2016. Retrieved April 12, 2020.
familysearch.org
"New York, New York City Births, 1846-1909," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2W88-MHX : 11 February 2018), William Haade, 02 Mar 1903; citing Manhattan, New York, New York, United States, reference cn 14830 New York Municipal Archives, New York; FHL microfilm 1,983,862.
"New York, New York City Municipal Deaths, 1795-1949," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:2W98-BVH : 2 June 2020), Bernard Haade in entry for Anna Haade, 19 Jul 1908; citing Death, Manhattan, New York City, New York, United States, New York Municipal Archives, New York; FHL microfilm 1,323,191.
"United States, Social Security Numerical Identification Files (NUMIDENT), 1936-2007", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:6K4Q-NDZ5 : 11 February 2023), Anna Sincere in entry for William Joseph Haade, .
"United States, Social Security Numerical Identification Files (NUMIDENT), 1936-2007", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:6K48-K6B3 : 11 February 2023), Anna R Sincere in entry for Edward John Haade, .
ibdb.com
"William Haade". Internet Broadway Database. The Broadway League. Archived from the original on December 27, 2016. Retrieved April 12, 2020.