Faruqee, Rashid
World Bank , 1981
Buku Teks
edited, John B. Williamson, Linda Evans and Michael Rustad
Little, Brown, 1985
Buku Teks
Parrillo, Vincent N., author
John Wiley & Sons, 1985
Buku Teks
Mooney, Linda A., author
Wadsworth, Thomson Learning, 2000
Buku Teks
Currie, Elliott, author
Little, Brown, 1984
Buku Teks