StructureAndInterpretationOfComputerPrograms
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Behold the Wizard. His magic is LambdaCalculus.

http://mitpress.mit.edu/sicp/full-text/book/cover.jpg

Full Text Online at http://mitpress.mit.edu/sicp/full-text/book/book.html

Also have a look at the most excelent video Lectures that Abelson and Sussman have held:
http://swiss.csail.mit.edu/classes/6.001/abelson-sussman-lectures/
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CategoryBook