O działaniach poniżej progu otwartej wojny: Robinson, Linda, Todd C. Helmus, Raphael S. Cohen, Alireza Nader, Andrew Radin, Madeline Magnuson, and Katya Migacheva, Modern Political Warfare: Current Practices and Possible Responses, Santa Monica, Calif.: RAND Corporation, RR-1772-A, 2018. As of April 07, 2018l