NIST just finalized their new guidance on securing BGP. It is a good read if you deal with BGP. Discusses threats to global routing, and how to help secure it by using RPKI, Source validation, etc.
https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-189.pdf
-Otanx
^ This is important. Thanks, Otanx, for the link.