Here you can find lists of great Complexity books are or have been used to teach courses at Oxford.
By: Michael Sipser
By: Sanjeev Arora, Boaz Barak
By: Ingo Wegener, R. Pruim
By: Christos Papadimitriou
By: Michael R. Garey, David S. Johnson
By: Thomas H Cormen, Charles E Leiserson, Ronald L Rivest
By: Oded Goldreich
By: Vijay V. V. Vazirani