Natural Language Processing with Python, Steven Bird, Ewan Klein, and Edward Loper, 2009 (O'Reilly Media) - Provides practical examples and implementations of tokenization, stemming, lemmatization, and stop word removal using the NLTK library, suitable for beginners.
spaCy Documentation: Processing Pipelines, Explosion, 2024 - Official documentation explaining spaCy's processing pipeline, including tokenization, linguistic annotations, and custom components, offering a modern perspective on NLP workflows.