
"Most textbooks designed for a one-year course in mathematical statistics cover probability in the first few chapters as preparation for the statistics to come. This book in some ways resembles the first part of such textbooks: it's all probability, no statistics. But it does the probability more fully than usual, spending lots of time on motivation, explanation, and rigorous development of the mathematicsa ]. The exposition is usually clear and eloquenta ]. Overall, this is a five-star book on probability that could be used as a textbook or as a supplement." MAA online
BookA Natural Introduction to Probability Theory