Lumbee recognition: What does it really mean?
Locklear, Mark. "Lumbee recognition: What does it really mean?" Robesonian Monday, June 18, 2007.
Federal acknowledgement
Breaking into the intergovernmental matrix: the Lumbee Tribe's efforts to secure federal acknowledgment.
Wilkins, David E. "Breaking into the intergovernmental matrix: the Lumbee Tribe's efforts to secure federal acknowledgment." Publius: The journal of federalism 23. 4 (Fall 1993): 123-142. 
Key source
