TITLE: Good introductory books on homological algebra
QUESTION [33 upvotes]: Which books would you recommend, for self-studying homological algebra, to a beginning graduate (or advanced undergraduate) student who has background in ring theory, modules, basic commutative algebra (some of Atiyah & Macdonald's book) and some (basic) field theory?
I would especially like to hear your opinions on the following books:
A Course On Homological Algebra / P. J Hilton and U. Stambach
Introduction to Homological Algebra / Szen-Tsen Hu
Notes on Homological Algebra / Rotman
But other recommendations will also be appreciated.

REPLY [4 votes]: See "An introduction to homological algebra" of Rotman (2010). I think this is the book Mark was talking about. It is VERY introductory.