Phillipe Sands (2003) Principles of International Environmental Law. 2nd Edition. p. xxi Available at [1] 31 Temmuz 2020 tarihinde Wayback Machine sitesinde arşivlendi. Accessed 19 February 2020
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Phillipe Sands (2003) Principles of International Environmental Law. 2nd Edition. p. xxi Available at [1] 31 Temmuz 2020 tarihinde Wayback Machine sitesinde arşivlendi. Accessed 19 February 2020