A TARDIS has at least two libraries, each a different size. The larger Library takes up dozens of rooms, and each of these rooms has two shelves, which are a couple of miles long and tall. A brass ladder or spiral staircase provides access to the upper levels.

Most of the "books" are stored in trionic lattice data cubes that are kept in book-shaped cases, but some of the books are capable of reading themselves out loud. A TARDIS uses the Telepathic Circuits and the Architectural Configuration Program to help the crew find the data they are looking for.