TITLE: Alternatives to "Sketches of an Elephant" Volume 3
QUESTION [11 upvotes]: The third volume of Peter Johnstone's massive compendium of topos theory, "Sketches of an Elephant", is yet to be published. The volume is supposed to discuss cohomology and mathematical universes in the context of topos theory. While we wait for the publication of this volume, are there any alternative (hopefully just as comprehensive) references for the aforementioned subjects?

REPLY [5 votes]: Johnstone's 1977 book 'Topos Theory' is a very good source.