Cita APA

Bird, S., Klein, E., & Loper, E. (2009). Natural language processing with Python (1. edition.). Beijing: O'Reilly.

Citación estilo Chicago

Bird, Steven, Ewan Klein, y Edward Loper. Natural Language Processing With Python. 1. edition. Beijing: O'Reilly, 2009.

Cita MLA

Bird, Steven, Ewan Klein, y Edward Loper. Natural Language Processing With Python. 1. edition. Beijing: O'Reilly, 2009.