3Houton S E & Hafstrom J L. (1985). Income elasticities for selected consumption categories: Comparison of single female- headed and tow-parent families. Home Economics Research Journal, 13(3), 292--303.
4Abdel-Ghany M & Schwenk F. (1993). Differences in consumption patterns of single- parent and two- parent family in the united states. Journal of Family and Economics Issues, 14,299-315.
5Sandra J Huston, The Household Expenditure Ratio:Exploring the Importance of Education. Journal of the Family Economics and Resource Management Division of AAFCS. 1995.
6Edward P Lazear, Education: Consumption or Product.Journal of Political Economy, (June 1977) vol 85. no 3. pp569-597, June 1977.
