Thomas, Maude. Away Down Home: A History of Robeson County, North Carolina. Lumberton: Historic Robeson, 1982. Index. By May Bell Lontz, et al. Lumberton: Historic Robeson, 1988.
Ch. 2 analyzes various origin theories. Ch. 11, pp. 149-61, covers Lumbee disfranchisement and the Henry Berry Lowry period. The book includes other brief mentions.
Robeson County Public Library, Lumberton, NC.