Barry, P., & Griffiths, D. (2009). Head first programming: A learner's guide to programming using the Python language (1st edition.). O'Reilly ; Shroff Publishers and Distributors.

Barry, Paul, and David Griffiths. Head First Programming: A Learner's Guide to Programming Using the Python Language. 1st edition. Beijing ; Sebastopol, CA : New Delhi: O'Reilly ; Shroff Publishers and Distributors, 2009.

Barry, Paul, and David Griffiths. Head First Programming: A Learner's Guide to Programming Using the Python Language. 1st edition. O'Reilly ; Shroff Publishers and Distributors, 2009.