cisco bgp-4 command and configuration handbook
BGP RPKI: instructions for use
Internet routing architectures: [the definitive BGP resource]
Configuring Bgp On Cisco Routers
BGP in the Data Center
IP Switching and Routing Essentials : Understanding RIP, OSPF, BGP, MPLS, CR–LDP, and RSVP–TE
Troubleshooting BGP: A Practical Guide to Understanding and Troubleshooting BGP (Networking Technology)
The Fast-Track Guide to VXLAN BGP EVPN Fabrics: Implement Today’s Multi-Tenant Software-Defined Networks
Cisco Networkers - Troubleshooting Bgp In Large Ip Networks
Day One: Deploying BGP FlowSpec