Aubin, Jean-Pierre, author
John Wiley & Sons, 1977
Buku Teks
Folland, Gerald B., author
CRC Press, 1995
Buku Teks
San Diego : Sosiological Abstracts Inc.
Majalah, Jurnal, Buletin
Research Institute Of Udayana University, 1997
Buku Referensi
Kurtz, David C., author
McGraw-Hill, 1992
Buku Teks