by Dan Jurafsky and James H. Martin: Often cited as the most comprehensive NLP textbook. The authors provide frequently updated PDF drafts .

by Simon J.D. Prince: A modern, visually-driven guide. A direct PDF download is available via the book's GitHub.

by Ian Goodfellow, Yoshua Bengio, and Aaron Courville: While a general deep learning book, it provides the essential mathematical foundation for NLP. You can read it for free on the official book website .

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