[Tutor] Suggested books for Agile Programming & Testing?

[Stephen McInerney]

Can anyone recommend me the best single must-read book for Agile 
Programming?
Also Agile Testing.

(If they compare Agile in general to the other methodologies, that would be 
great)

Also, can anyone comment on the limits or caveats of agile development?

Thanks,
Stephen

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