The New York Sun - a newspaper published in the 1800's
First source: Abinder cites Sun as the first newspaper to report of the conditions in Five Points. This is a primary source because it is an eyewitness account of the area and it’s inhabitants.
Second source: Abinder cites Realities of Irish Life by William Stuart Trench when relating the Sligo natives to the Cork immigrants. This is a primary source because it is eyewitness accounts, published in 1869.
Third source: Abinder cites the Tribune a number of times throughout his book. This is a primary source because it is a newspaper that was being published throughout the 1800’s.