The best book on punctuation that I have read is M. B. Parkes. Pause and Effect: An Introduction to the History of Punctuation in the West. Berkeley/Los Angeles, CA. University of California Press, 1993. ESPECIALLY if you are interested in the history of punctuation, you should get this. Be warned in advance, though, it is an extremely scholarly book, written by a lecturer in Paleography, Oxford University. (I found it readable, though, and MUCH worth reading.) Also be advised that it is extremely expensive, but perhaps you can find one in your local university library, as I did.
Ed Schuster
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