The Protestant Irish or Scotch-Irish were immigrants from Ireland to America of Protestant background. Most were Presbyterians. The arrived mostly in the period 1740-1770, heading especially to the frontier regions.
- Glazier, Michael, ed. The Encyclopedia of the Irish in America, (1999), the best place to start--the most authoritative source, with essays by over 200 experts; covers both Catholics and Protestants.
- Blethen, Tyler Ulster and North America: Transatlantic perspectives on the Scotch-Irish (1999) online at ACLS History e-book project
- Fischer, David Hackett. Albion's Seed: Four British Folkways in America (1991), major scholarly study tracing colonial roots of four groups of immigrants, Irish, English Puritans, English Cavaliers, and Quakers.
- Griffin, Patrick. The People with No Name: Ireland's Ulster Scots, America's Scots Irish, and the Creation of a British Atlantic World, 1689-1764. (2001)
- Leyburn, James G. Scotch-Irish: A Social History (1989), scholarly survey; good starting point.
- McWhiney, Grady. Cracker Culture: Celtic Ways in the Old South (1989), scholarly interpretation
- Meagher, Timothy J. The Columbia Guide to Irish American History. (2005).
- Webb, James. Born Fighting: How the Scots-Irish Shaped America(2004) by a popular novelist who is now Senator from Virginia; not considered reliable by scholars.