1. Ali, S. H. and I. Shari: 1989, ?Kemiskinan di Malaysia: Satu penilaian terhadap anggaran resmi dan implikasinya? [Poverty in Malaysia: An evaluation on official estimates and their implication], Paper presented at the Fourth Conference of the Association of Social Science, University Malaya, Kuala Lumpur.
2. Social Dimensions of Adjustment in Sub-Saharan Africa Working Paper;E. O. Boateng,1990
3. Clarkson, G. P. E.: 1963, The Theory of Consumer Demand: A Critical Appraisal (Prentice-Hall, Inc., Englewood Cliffs, N. J.)
4. DeVanzo, J. and M. W. Kusnic: 1984, Regional Income Differences and the Definition of Income: The Case of Malaysia (The Rand Corporation, Santa Monica).
5. Deaton, A. and J. Muellbauer: 1984, Economics and consumer Behavior (Cambridge University Press, Cambridge).