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. (n.d. ). "Homeland and Civil Security Learning and Research Guide". In Cross-Disciplinary Perspectives on Homeland and Civil Security. Bern, Switzerland: , . Retrieved Nov 20, 2019, from https://www.peterlang.com/view/9781454191117/lit.html

. "Homeland and Civil Security Learning and Research Guide". Cross-Disciplinary Perspectives on Homeland and Civil Security. Bern, Switzerland: , , n.d. . < https://doi.org/10.3726/978-1-4539-1579-0/33>. Web. 20 Nov. 2019.

. "Homeland and Civil Security Learning and Research Guide". In Cross-Disciplinary Perspectives on Homeland and Civil Security, (Bern, Switzerland: , , n.d. ) accessed Nov 20, 2019, https://doi.org/10.3726/978-1-4539-1579-0/33

(n.d. ). Homeland and Civil Security Learning and Research Guide. In Cross-Disciplinary Perspectives on Homeland and Civil Security, Bern, Switzerland: , . available from: < https://doi.org/10.3726/978-1-4539-1579-0/33> [Accessed 20 November 2019]