W.W. Norton and Company Inc., 1957
Buku Teks
Crocker, Walter R. (Walter Russell), 1902-, author
Melbourne University Press, 1971
Buku Teks
Barston, R. P.
Longman, 1988
Buku Teks
Warouw, Esther M.F., author
Fakultas Hukum Universitas Indonesia, 2013
UI - Skripsi (Membership)
Boyce, P.J.
University of Queensland Press , 1977
Buku Teks