Here is a very good free textbook: Group Theory, JS Milne: http://www.flooved.com/reader/3425
and from a physicist's point of view by Kundu, Calcutta: http://www.flooved.com/reader/3357#1
Here is a very good free textbook: Group Theory, JS Milne: http://www.flooved.com/reader/3425
and from a physicist's point of view by Kundu, Calcutta: http://www.flooved.com/reader/3357#1