| Notes |
- "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSVQ-922 : accessed 13 July 2020), Louis Rosentreker, Borough of Manhattan, Election District 2 New York City Ward 10, New York County, New York, United States; citing enumeration district (ED) 222, sheet 19A, family 340, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,091.
- "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M5Q1-7MH : accessed 19 July 2020), Bertha Rosentreter in household of Louis Rosentreter, Manhattan Ward 12, New York, New York, United States; citing enumeration district (ED) ED 308, sheet 4A, family 76, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1014; FHL microfilm 1,375,027.
- https://www.ancestry.com/imageviewer/collections/60749/images/45211_srep100%5E058204-00015?treeid=&personid=&hintid=&usePUB=true&usePUBJs=true&_ga=2.139159411.1723906238.1604025137-999735092.1601344907&pId=4417953
- Poznan Project
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