Caiden, Naomi
Planning and budgeting in poor countries
John Wiley & Sons, 1974
 Buku Teks SO
Rostow, Walt Whitman
Rich countries and poor countries : reflections on the past, lessons for the future
Westview Press, 1987
 Buku Teks
A study of contemporary Ghana Volume II : some aspects of social structure / edited, Walter Birmingham
Northwestern University Press, 1967
 Buku Teks SO
Pechman, Joseph A.
Tax reform, the rich and poor
Harvester Wheatsheaf, 1989
 Buku Teks
Ward, Barbara
The rich nations and the poor nations
W.W. Norton, 1962
 Buku Teks SO