Cipolla, Carlo M.Literacy and Development in the West Harmondsworth, Middlesex , England: Penguin, 1969.
2.
Department of Statistics, Singapore. Report on the Census of Population, 1970, Singapore. 1973.
3.
Doraisamy, T. R. (ed.) 150 Years of Education in Singapore. Singapore: Teachers' Training College, 1969.
4.
Fishman, Joshua A., and Terry, C. "The Validity of Census Data on Bilingualism in a Puerto Rican Neighbourhood ", American Sociological Review, 34: 636-49, 1969.
5.
Gonzales, Andrew. "The Future of English in Asia," in Proceedings of the Conference on Language Policy and Language Development of Asian Countries . Manila, Philippines, 18-22 December 1972. Manila: Pambansang Samahan Sa Linggwistikang Pilipino, Ink, 1972.
6.
Lerner, Daniel.The Passing of Traditional Society. New York: Free Press, 1958
7.
Ministry of Education, Singapore. Education in Singapore. Second ed. Singapore: Educational Publications Bureau, 1972.