Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

Bird, Steven, Ewan Klein, agus Edward Loper. Natural Language Processing with Python. First edition. Beijing ; Cambridge, Mass.: O'Reilly, 2009.

Lua MLA (8ú heag.)

Bird, Steven, et al. Natural Language Processing with Python. First edition. O'Reilly, 2009.

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