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 (20190709). Part I Preliminary topics, 2 The sources of international law. In Brownlie's Principles of Public International Law. : Oxford University Press. Retrieved 22 Jan. 2021, from https://opil.ouplaw.com/view/10.1093/he/9780198737445.001.0001/he-9780198737445-chapter-2.

"Part I Preliminary topics, 2 The sources of international law." Brownlie's Principles of Public International Law. : Oxford University Press, . Oxford Public International Law. Date Accessed 22 Jan. 2021 <https://opil.ouplaw.com/view/10.1093/he/9780198737445.001.0001/he-9780198737445-chapter-2>.

"Part I Preliminary topics, 2 The sources of international law." In Brownlie's Principles of Public International Law. : Oxford University Press, 20190709. https://opil.ouplaw.com/view/10.1093/he/9780198737445.001.0001/he-9780198737445-chapter-2.

. Part I Preliminary topics, 2 The sources of international law. In: Brownlie's Principles of Public International Law. 9th Edition ed. Oxford University Press; 2019. https://opil.ouplaw.com/view/10.1093/he/9780198737445.001.0001/he-9780198737445-chapter-2. Accessed January 22, 2021.