As you begin this, you are given a A Treaty on Tanning Skin. Head to the East then turn to the South and enter the Cemetery of the Basilica itself. head through the first gate and use Eagle Vision. This will locate a book sitting on the ground nearby a few statues leaning against a tree. By one of the open crypts you will find The Holy Bible.
Time to head over into the Cemetery District from here. It is a good run to the East. In the district, you will see a small Red Restricted Zone within the Search area, go tot he Eastern edge of that and get to the far side of the wall. Sitting on the table you will find the final book you are looking for. This is a Journal