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Michael Brecher (26 de maio de 2016). The world of protracted conflicts. Lanham, Maryland: [s.n.] p. 11. ISBN978-1-4985-3188-7. OCLC1253439132; citing Gary Goertz; Paul F. Diehl (Junho de 1993). «Enduring Rivalries: Theoretical Constructs and Empirical Patterns». International Studies Quarterly. 37 (2). pp. 147–171
Michael Brecher (26 de maio de 2016). The world of protracted conflicts. Lanham, Maryland: [s.n.] p. 11. ISBN978-1-4985-3188-7. OCLC1253439132