Antonelli, Cristiano
Kluwer Academic Publisher, 1995
Buku Teks
edited by Nathan Rosenberg
Penguin Books, 1971
Buku Teks
Rosen, George, author
Free Press, 1958
Buku Teks
Doessel, D. P.
Avebury, 1992
Buku Teks
edited by Stephan Haggard and Chung-In Moon
Westview Press, 1989
Buku Teks