Buchanan, James M., author
Liberty Fund, Inc., 2003
Buku Referensi
Ohio Ross Laboratories, 1978
Buku Teks
Hoffman, William M.
Vintage Books , 1985
Buku Teks
Fisher, James Earnest
Yonsei University Press, 1970
Buku Teks
Butler, William J.
International Commission of Jurists, 1977
Buku Teks