What are good introductory textbooks available on Cohomology of Groups?



Introductory text on Group Cohomology
At the undergraduate level, some elements of group cohomology is explained in John Moody's book "Groups for Undergraduates" [http://www.amazon.com/Groups-Undergraduates-John-Atwell-Moody/dp/9810221053](http://rads.stackoverflow.com/amzn/click/9810221053) At more advanced (but still undergraduate) level, see Maxim Stykow's Honours B.Sc. thesis "Introduction to
Group Cohomology" <http://www.math.ubc.ca/~maxim/stykow_group_cohomology.pdf>


At the graduate level, a good choice seems to be the above mentioned Ken Brown's book "Cohomology of Groups" [http://www.amazon.com/Cohomology-Groups-Graduate-Texts-Mathematics/dp/0387906886](http://rads.stackoverflow.com/amzn/click/0387906886) 


