APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (8:e uppl.)

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