A Book of Abstract Algebra C. Pinter One of the friendliest introductions to abstract algebra you'll find.
Algebra T. Hungerford A dense dictionary of abstract algebra that's better as a reference than a textbook
Kronecker Products and Matrix Calculus with Applications A. Graham A reader will need a good background in matrix theory before using this book. Contains matrix calculus generally not found elsewhere, but not a particularly well-written text.