Talmudic sources in the sage entries
Every sage entry rests on an actual page of Gemara. Here is the reverse index: pick a tractate, type a daf, and see which builders of the Talmud speak there.
Scriptural verses cited in the sage entries
Every derashah rests on a verse. Here are all the verses cited in the entries, by book and chapter, searchable by book, chapter, verse or sage.