2Ireland, Aideen M. "Roger Chambers Walker: A Sligo Antiquarian." The Journal of Irish Archaeology 11 (2002): 150.
The author quotes William Stokes reporting that Petrie was a "guest at the neighbouring house of Rathcarrick, the residence of Mr Walker, a gentleman endeared to him by old friendship, by the fascination of his manners, and his fondness for antiquarian pursuits." (Stokes, William. The Life and Labours in Art and Archæology, of George Petrie ... London: Longmans, Green, &, 1868. 240.)