^Compare:
Crozier, Brian. Political Victory: The Elusive Prize Of Military Wars. New Brunswick, New Jersey: Transaction Publishers. 2005: 202-203 [2015-07-30]. ISBN 9781412831277. （原始内容存档于2020-08-04）. At its height, communism was the major threat to world peace, and by far the major source of international terrorism: that is, communist-inspired and/or communist-supported terrorism. Its hold on terrorist movements was not universal, however [...].
^Paoletti, Ciro. A military history of Italy. Praeger Publishers. 30 December 2007. ISBN 978-0-275-98505-9.
