Even though individual entries for Tracy K. Smith may not be available, these resources will help familiarize you with literary terms/concepts and selected authors.
EncyclopediasOxford English Dictionary
--Reference Stacks--PE 1625.O87 Online version
The Concise Oxford Dictionary of Literary Terms
--online-- netLibrary e-book
A Dictionary of Literary Terms and Literary Theory
--Reference Stacks-- PN 41 .C83