Students, the finest little (and relevant/up to date!) library is that of the Rome office of Human Life International. This library is just a quick minute walk from the Vatican and was founded and has been maintained by the great Msgr. Ignacio Barreiro, STD.
A great place to study and/or to find the right books. Thanks, Msgr.!
Vita Umana Internazionale
Piazzale Gregorio VII, 22 (ring number four as it's marked)