Best Bet! The MLA Bibliography is the best source for locating critical sources from scholarly articles and chapters in books
Sample Search for critical sources from books:
Eliot, T. S. (Thomas Stearns), 1888-1965 Criticism and interpretation.
T.S.Eliot Society of the United Kingdom
This site is intended as a resource hub, for those wishing to find out more about Eliot’s work and life, as well as providing news about events, performances and publications of interest to Eliot enthusiasts.
International T. S. Eliot Society
Founded in 1980, the Society is an international association of persons interested in the art and though of T.S.Eliot
Wikipedia entry about the Criterion, the literary magazine created by T.S.Eliot