Oxford University Press, 1992
Buku Referensi
World Bank
Oxford University Press, 1992
Buku Teks SO
The World Bank; Dono Sumardi, translator
Salemba Empat, 2006
Buku Teks SO
World Bank
World Bank, 1991
Buku Teks SO
World Bank
Oxford University Press, 1995
Buku Teks SO