World Bank, 1980
Buku Teks
edited by Benjamin Torun, Vernon R. Young, and William M. Rand
The United Nations University, 1981
Buku Teks
Artikel Jurnal
James, William E., author
Asian Development Bank, 1983
Buku Teks
Page, Sheila, author
Overseas Development Institute, 2000
Buku Teks