This book is one of a small handful commonly referenced when someone asks for a [Scheme] reference book. Beyond that it is a very good introduction into computational concepts in general.

 Abelson, Harold 
    Structure and interpretation of computer programs / Harold Abelson 
    and Gerald Jay Sussman, with Julie Sussman. -- 2nd ed. 
    p. cm. -- (Electrical engineering and computer science 
    series) 
    Includes bibliographical references and index. 
    ISBN 0-262-01153-0 (MIT Press hardcover) 
    ISBN 0-262-51087-1 (MIT Press paperback) 
    ISBN 0-07-000484-6 (McGraw-Hill hardcover) 
    1. Electronic digital computers -- Programming. 2. LISP (Computer program language) I. Sussman, Gerald Jay. II. Sussman, Julie. III. Title. IV. Series: MIT electrical engineering and computer science series. 
 QA76.6.A255         1996 
 005.13'3 -- dc20              96-17756 
 Fourth printing, 1999 

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

Lecture videos: http://groups.csail.mit.edu/mac/classes/6.001/abelson-sussman-lectures/

It's also a classic of language theory, quite apparent from its use
of [Scheme] for exposition; in fact, [CL] hears more recommendations of
it as a tutorial on programming principles than for Scheme.
For the latter role, the usual candidates are '''The Little Schemer''',
...

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In [Serial summing], some SICP examples are translated to Tcl, from summing an integer sequence to integral and derivative. See also:
[Streams] - [Procs as objects] - [Generic operations]

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