"Massachusetts Births and Christenings, 1639-1915," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VQXF-KZ9 : accessed 5 October 2015), Josiah Coolidge, 05 Apr 1787; citing CAMBRIDGE,MIDDLESEX,MASSACHUSETTS, ; FHL microfilm 496,864.
US Fed census 1850 Cambridge, Middlesex County, Massachusetts
"Massachusetts Deaths, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N7GP-4LK : accessed 5 October 2015), Josiah Coolidge, 13 Sep 1874; citing Watertown, Massachusetts, v 266 p 211, State Archives, Boston; FHL microfilm 960,205.
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