Eisenmann, Charles, author
Unesco, 1954
Buku Teks
Perry, Michael J.
Oxford University Press , 1990
Buku Teks
Shinohara, Hatsue, author
Cambridge University Press, 2012
Buku Teks
Kenny, Philip H.
Butterworth, 1994
Buku Teks
edited by Charles J. White and Norman Gross
American Bar Association , 1985
Buku Teks