World Bank
Oxford University Press, 1991
Buku Teks
Handelman, Howard, author
Pearson/Prentice Hall, 2006
Buku Teks
World Bank
Oxford University Press, 1982
Buku Teks
World Bank
Oxford University Press, 1988
Buku Teks
World Bank
Oxford University Press, 1989
Buku Teks