HTAccess

Apache Cookbook: Solutions and Examples for Apache Administrators
$35.00
The Apache Cookbook is a must have for anyone considering running their own Apache web server. It covers every major feature of Apache and does so without giving too information to the new user while giving more experienced users the guidance to go off on their own and become Apache power users in their own right.

The Definitive Guide to Apache mod_rewrite
$54.99
This book is perfect for programmers AND webmasters! Before reading this book I had very limited knowledge of what mod rewrite was or how it worked. After I finished it I was able to:

1. Make search engine friendly URLs (dynamically generated by my site) work.

2. Block bad bots and remote file inclusion attempts.

3. Rename pages or move them seamlessly.

I would recommend this book to anyone, it was easy to understand even from the point of view of someone just starting out.

Pro Apache, Third Edition (Expert's Voice)
$49.99
Like ALMOST everything I have purchased from this publisher, this is a competent and useful resource on the topic.