Bird, S., Klein, E., & Loper, E. (2009). Natural language processing with Python (First edition.). O'Reilly.
Chicago (17e ed.) BronvermeldingBird, Steven, Ewan Klein, en Edward Loper. Natural Language Processing with Python. First edition. Beijing ; Cambridge, Mass.: O'Reilly, 2009.
MLA (8e ed.) BronvermeldingBird, Steven, et al. Natural Language Processing with Python. First edition. O'Reilly, 2009.
Let op: Deze citaties zijn niet altijd 100% accuraat.