http://www.wildague.com/Genealogy/getperson.php?personID=I5940&tree=main_tree
http://www.jeaniesgenealogy.com/2013/01/john-clough-of-salisbury-ma.html “TheGenealogy and Descendants of John Clough of Salisbury, Massachusetts”,published 1952, by The John Clough Genealogical Society, Inc.