January 28 is the Feast day of St. Thomas Aquinas. Here are some resources and links that can help you understand why St. Thomas is a Doctor of the Church and the patron of schools, universities, students and book sellers.
Thomistica: http://thomistica.net is a website devoted to the academic study of St. Thomas Aquinas (a.d. 1225-1274), the medieval Italian theologian of the Order of Friars Preachers (Dominicans). This site is designed to provide ready access to up-to-date information about resources for scholars of Aquinas, via constantly-updated news and commentary pages. (from their website)
St. Thomas Aquinas in English http://www.home.duq.edu/~bonin/thomasbibliography.html provides a thorough Bibliography of works by and about St. Thomas. It has links to primary source documents. See also the Christian Classics Ethereal Library
GK Chesterton’s biography of St. Thomas as a pdf from Project Gutenberg.
Stanford Encyclopedia of Philosophy St. Thomas Aquinas
American Catholic’s Saint of the Day St. Thomas Aquinas
St. Thomas Aquinas Prayer for Scholars from Patheos