Hello,


I am looking for a reference (if it exists) that makes the link between cohomology of sheaves for sites and Galois cohomology : 


quickly said, I would like to see Galois cohomology (at least in the commutative case) as the cohomology of a sheaf over the étale site of extensions of k.


By the way, what is a reference for cohomology of sites ?


Thanks



Cohomology of sheaves for sites and Galois cohomology
The two references from my comment above, now with links!


* Milne, James S. Étale cohomology. Princeton Mathematical Series, 33. Princeton University Press, Princeton, N.J., 1980. xiii+323 pp. [MR0559531](http://www.ams.org/mathscinet-getitem?mr=MR0559531) You can get another set of notes on étale cohomology from his [web page](http://www.jmilne.org/math/CourseNotes/lec.html): «in comparison with my book, the emphasis is on heuristic arguments rather than formal proofs and on varieties rather than schemes».
* Tamme, Günter. Introduction to étale cohomology. Translated from the German by Manfred Kolster. Universitext. Springer-Verlag, Berlin, 1994. x+186 pp. [MR1317816](http://www.ams.org/mathscinet-getitem?mr=MR1317816)


