Cybersecurity Doctrine of the Republic of Poland. National Security Bureau (Biuro Bezpieczenstwa Narodowego), 2015.
Geng, Hwaiyu. Data Centre Handbook . USA: John Wiley & Sons, 2015.
Deaths from Conflict in Northern Ireland by Year and Status In
Conflict Archive on the Internet (CAIN). University of Ulster, 2015.
DEEP Ukraine 2015 Programme Review In
unclassified internal document. Political Affairs and Security Policy (PASP), 2015.
Defence Companies Anti-Corruption Index (CI) -2015 In
TI Defence and Security Programme. London: Transparency International UK, 2015.