- Proofs and types
- The full text of this book by Jean-Yves Girard, Yves Lafont and Paul Taylor, is now available online. Alternatively copies of the original book are available in the library.
- Toposes, triples and theories
- The full text of the new out of print book by Michael Barr and Charles Wells, the authors of Category theory for computing science (see below).
- Category theory for computing science
- Regretably the full text of this book is not available, but there is, nevertheless some useful material in the supplement available via this link, and also the solutions to the exercises.