Gould, W.T.S., author
John Wiley, Longman Scientific, 1993
Buku Teks
edited by Keith Watson
Croom Helm, 1982
Buku Teks
Panitchpakdi, Supachai
Asia Society, 1974
Buku Teks
Psacharopoulos, George, author
World Bank, c1980
Buku Teks
edited by G.J. Alaerts, N.L. Dickinson
CRC Press, Taylor & Francis Group, 2009
Buku Teks