Not to take anything away from the books on the topic, but my favorite source is the docs that got installed with postgres (/usr/local/pgsql/doc/html).
The index isn't great, but easily overcome: grep -i "search phrase" /usr/local/pgsql/doc/html/* | less
Try to do that with a book. :-)
That brings ujp a good point, indexes in many technical bools are pathetic.
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