Peterson, R. T. 2010. A Field Guide to the Birds of Eastern and Central North America (sixth edition) (or the slightly more pocket-sized fifth edition, 2002) (flexible biinding). Houghton-Mifflin.

ABSOLUTELY NOT Peterson's (2008) Field Guide to the Birds of North America, which is way to big to fit in a pocket!!

Hilty, S. 2005. Birds of Tropical America: A Watcher's Introduction to Behavior, Breeding, and Diversity (paperback). University of Texas Press.

UNC Student Stores should have copies of both books.   So does amazon.com.