Artikel Jurnal
I Putu Gede Ary Suta, 1958-, author
Yayasan SAD Satria Bhakti, 2000
Buku Teks
Wilson, Thomas, author
Clarendon Press, 1984
Buku Teks
Auerbach, Robert D., author
Macmillan, 1989
Buku Teks
Stigum, Marcia
Illinois Dow Jones- Irwin , 1983
Buku Teks