From Plato to Quine, this text provides a collection of the essential, classic readings in the theory of knowledge. It contains 20 historical contributions, from the earliest times to Wittgenstein and from China to the USA. Several of the texts address the problem of scepticism.
For not being a monograph it at least gives you a taste of the splendor which is Classical Epistemology. If you are having trouble understanding the contemporary works try to go back to a book such as this one.