Books:

     Internet Routing Architectures

     Cisco BGP-4 Command and Configuration Handbook                                                

     BGP Design and Implementation

     Routing TCP/IP Volume II

URLS:

     BGP4 Case Studies/Tutorial by Sam Halabi

Live Internet Information:

     Telnet to a live BGP router (IE 7 users - telnet to route-views.oregon-ix.net)

     Level 3 Looking Glass

     Netconfigs

     Cisco BGP Config Tool

     Traceroute.org

     AS Path Length Graph

     Route Views

     BGPlay 

     WhoIS for AS Numbers - Enter AS number in URL

     BGP Reports

     Caida.org 

Configuration and other information:

     Configuring BGP

     BGP Case Studies

     Configuring the BGP Local-AS Feature 

     Cisco BGP URLS

     BGP Experts

     Load Sharing with BGP

     How to Use HSRP to Provide Redundancy  

     BGP Dynamic Peer groups 

     Joe's BGP Links 

Regular Expressions:

     BGP regular expressions explained 

     Using Regular Expressions in BGP 

Optimization:

     BGP Nonstop Forwarding (NSF) Awareness

     Peer templates 

     Troubleshooting High CPU Caused by the BGP Scanner or BGP Router Process