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"Foundations of Computer Science" by Aho and Ullman is an excellent book and freely available: http://i.stanford.edu/~ullman/focs.html http://i.stanford.edu/~u

• pjmorris 5y ago
  Came here to recommend the same. From the book's website: "This book has been taken out of print by W. H. Freeman. You are welcome to use it if you like. We believed in 1992 it was the way to introduce theory in Computer Science, and we believe that today." The book's introduction to stacks is in chapter 6, link: http://infolab.stanford.edu/~ullman/focs/ch06.pdf http://infolab.stanford.edu/~ullman/focs/ch06.pdf