The Picts

https://scotlandinmyheartsite.wordpress.com/2016/01/10/who-are-the-picts-scotlands-dna-at-last-finds-an-answer/

The Scots-Irish in the Southern United States: An Overview

http://www.archives.com/experts/garstka-katharine/the-scots-irish-in-the-southern-united-states-an-overview.html

Scottish Genealogy

https://familysearch.org/learn/wiki/en/Scotland

Highland Scots

http://www.northcarolinahistory.org/commentary/110/entry