edited by Kenneth Lee, Anne Mills
Oxford University Press, 1984
Buku Teks
Phelps, Charles E.
Harper Collins, 1992
Buku Teks
Donaldson, Cam
Macmillan, 1994
Buku Teks
Akin, John S.
World Bank, 1987
Buku Teks
Mooney, Gavin H.
Harvester Wheatsheaf, 1994
Buku Teks