Ross, Alf, author
Stevens & Sons Limited, 1958
Buku Teks
Freund, Paul A., author
Harvard University Press, 1974
Buku Teks
Ross, Alf, author
University of California Press, 1959
Buku Teks
Eva Achjani Zulfa, author
Faculty of Law University of Indonesia, 2011
Artikel Jurnal
Callahan, Daniel
Collier-Macmillan Ltd., 1970
Buku Teks