Algorithmic Introduction to Coding Theory (References)
Shannon's original paper is available from the Bell Labs website.
A good source on information theory is the text by
Cover and Thomas. In particular, this lecture refers to material
from Chapters 2 and 8 of this book. See also pages 1 to 12 from
Lecture 1 of my
Claude E. Shannon.
A Mathematical Theory of Communication.
Bell Systems Technical Journal,
Vol 27, pp. 379-423, 623-656, July, October, 1948.
Thomas M. Cover and Joy A. Thomas.
Elements of Information Theory.
Wiley Publishing, New York, 1991.