Capell, F.J. (1981), A study in alternatives in American education, Vol. IV, Student outcomes at Alum Rock 1974-1976, Rand Corporation: Santa Monica.
Carnoy, M. (1997), Is privatization through education vouchers really the answer? A comment on West, The World Bank Research Observer, Vol.12, No. 1, 105-116.
Carnoy, M. (1998), National Voucher Plans In Chile and Sweden: Did Privatization Reforms Make for Better Education?, Comparative Education Review, Vol. 42, No. 3, 309-337.
Castells, M (1998). End of Millennium: the information age – economy, society and culture, Vol. III. Oxford: Blackwell.
Cohen, D. and E. Farrar (1977), Power to the parents? – The story of education vouchers, The Public Interest, Vol. 48, 72-97.
Couch, Jim F., William F. Shughart II and Al L. Williams (1993) ”Private school enrollment and public school performance.” Public Choice 76:301-312.