Dummitt and Foote suggested above is a great text on the subject and probably the best when it comes to a complete treatment of the theory.
The only complaint one could make is that it's written for mathematicians.
A more appropriate book for "lower level" students (in terms of mathematical maturity) would be John B. Fraleigh's "A First Course In Abstract Algebra".
The only complaint one could make is that it's written for mathematicians.
A more appropriate book for "lower level" students (in terms of mathematical maturity) would be John B. Fraleigh's "A First Course In Abstract Algebra".