"Fundamentals of Information Theory and Coding Design"
      Roberto Togneri, Chris J.S. deSilva

Errata
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Page 235: 4th paragraph, the last sentence should read 
"Alternatively, it is the result of XORing all the seven bits together"

Page 236: 2nd paragraph, the first sentence should read
"The parity check can be carried out easily by XORing all eight bits 
together."

Page 243: the last paragraph should read "If we consider 0 and 1 to 
represent truth values, then these tables are the truth tables of the bit 
operations XOR and AND, respectively."