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SOMMERVILLE, IAN. (2011). SOFTWARE ENGINEERING (NINTH EDITION). NEW YORK: Pearson Education Inc..

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SOMMERVILLE, IAN. SOFTWARE ENGINEERING. NINTH EDITION NEW YORK: Pearson Education Inc., 2011. Text.

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SOMMERVILLE, IAN. SOFTWARE ENGINEERING. NINTH EDITION NEW YORK: Pearson Education Inc., 2011. Text.

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SOMMERVILLE, IAN. SOFTWARE ENGINEERING. NINTH EDITION NEW YORK: Pearson Education Inc., 2011. Print.