APA (7th ed.) Citation

Bird, S., Klein, E. 1., & Loper, E. (2009). Natural Language Processing with Python: [analyzing text with the natural language toolkit] (1. ed.). O'Reilly.

Chicago Style (17th ed.) Citation

Bird, Steven, Ewan 194X- Klein, and Edward Loper. Natural Language Processing with Python: [analyzing Text with the Natural Language Toolkit]. 1. ed. Beijing [u.a.]: O'Reilly, 2009.

MLA (9th ed.) Citation

Bird, Steven, et al. Natural Language Processing with Python: [analyzing Text with the Natural Language Toolkit]. 1. ed. O'Reilly, 2009.