Vajjala, S., Majumder, B., Gupta, A., & Surana, H. (2020). Practical natural language processing: A comprehensive guide to building real-world NLP systems (First edition.). O'Reilly Media.

Vajjala, Sowmya, Bodhisattwa Majumder, Anju Gupta, and Harshit Surana. Practical Natural Language Processing: A Comprehensive Guide to Building Real-world NLP Systems. First edition. Sebastopol, CA: O'Reilly Media, 2020.

Vajjala, Sowmya, et al. Practical Natural Language Processing: A Comprehensive Guide to Building Real-world NLP Systems. First edition. O'Reilly Media, 2020.