Reference Sketches of an Elephant: A Topos Theory Compendium, Volume 1 [johnstone-elephant-vol1]

 @book
{johnstone-elephant-vol1, address={Oxford, England}, title={Sketches of an Elephant: A Topos Theory Compendium, Volume 1}, publisher={Clarendon Press}, author={Johnstone, Peter T.}, year={2002} }