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Pragmatic Python Programming : Learning Python the Smart Way by Gabor Guta...

Introduction to Computing and Programming in Python by Mark Guzdial (2005)

Programming Ruby: The Pragmatic Programmers' Guide, Second Edition

Programming Ruby : The Pragmatic Programmer's Guide 2nd

Programming Ruby 1.9: The Pragmatic Programmers' Guide by Andy Hunt Paperback

Programming Ruby: The Pragmatic Programmer's Guide, Second Edition,Dave Thomas,

Programming Ruby 1.9 & 2.0: The Pragmatic Programmers' Guide (... by Chad Fowler