http://genforum.com/ross/messages/1346.html History of Chester County PA: With Genealogical and Biographical ... by John Smith Futhey and Gilbert Cope
http://books.google.com/books?id=jJA6AQAAIAAJ&pg=PA737&lpg=PA737&dq=john+ross+1637&source=bl&ots=kGaMOz9aY_&sig=cttsSZxtBHA-yH9AkjbZztM9NGs&hl=en&sa=X&ei=Dnb9Ut3zFoPvoATYmQI&ved=0CE4Q6AEwBQ#v=onepage&q=john%20ross%201637&f=false .
http://familytreemaker.genealogy.com/users/c/r/a/Paul-L-Crawford/GENE1-0001.html