
https://focusweb.org/wp-content/uploads/2021/02/FGS_PB-1_rev-2.pdf

https://www.jstor.org/stable/pdf/resrep47386.pdf?refreqid=excelsior%3A52df592e24231e44d33302bbc1dca659&ab_segments=&origin=&initiator=&acceptTC=1

https://www.wilsonquarterly.com/quarterly/understanding-russia/russias-unrestricted-warfare-in-latin-america