Clark, R.B., author
Clarendon Press, 1986
Buku Teks
Davenport, S.J.
Washington, DC: United States Department of the Interior, 1954
Buku Teks
Frid, Christopher L. J., author
Oxford University Press, 2017
eBooks
edited by F.R. Benn and C.A. McAuliffe
Macmillan Press , 1975
Buku Teks
Anissa Yusha Amalia, author
Fakultas Hukum Universitas Indonesia, 2020
UI - Skripsi (Membership)