Michael Brecher. The world of protracted conflicts, May 26, 2016 — 11-bet. ISBN 978-1-4985-3188-7. OCLC1253439132.; citing Gary Goertz; Paul F. Diehl (June 1993). „Enduring Rivalries: Theoretical Constructs and Empirical Patterns“. 37-jild, № 2. 147–171-bet. {{cite magazine}}: Cite magazine requires |magazine= (yordam)
Michael Brecher. The world of protracted conflicts, May 26, 2016 — 11-bet. ISBN 978-1-4985-3188-7. OCLC1253439132.; citing Gary Goertz; Paul F. Diehl (June 1993). „Enduring Rivalries: Theoretical Constructs and Empirical Patterns“. 37-jild, № 2. 147–171-bet. {{cite magazine}}: Cite magazine requires |magazine= (yordam)