Colin-Jones, Graham, author
Times Books International, 1989
Buku Teks
Capricorn Indonesia , 1994
Buku Teks
Netzley, Michael, author
Prentice-Hall, 2001
Buku Teks
Institute of Social Studies
Institute of Social Studies, 2000
Buku Teks
The World Bank; Dono Sumardi, translator
Salemba Empat, 2006
Buku Teks