http://www.ncela.gwu.edu/miscpubs/nabe/brj/v20/20_34_lee.htm
Lee, P. (1996). Cognitive development in bilingual children: A case
for bilingual instruction in early childhood education. The Bilingual
Research Journal, 20, 499-522.
http://www.ncela.gwu.edu/ncbepubs/classics/focus/02aage.htm
Collier, V.(1987) The effect on age on acquisition of a second language
for school.
http://www.gse.harvard.edu/news/features/snow10012002.html
Looking closely at second language learning.(2002) An interview with
Catherine Snow, Harvard School of Education.
http://www.ncela.gwu.edu/ncbepubs/classics/focus/02bage.htm
Age-related factors in second language acquisition
Twyford, C. (1987)
http://www.stanford.edu/7Ehakuta/Docs/CriticaEvidence.pdf
Hakuta, K. Critical period in second language acquisition.
http://www.stanford.edu/~hakuta/Docs/CriticalPeriod.PDF
Hakuta disputes critical age hypothesis.
http://www.iteachilearn.com/cummins/
Homepage of Dr. Jim Cummins
http://ourworld.compuserve.com/homepages/JWCRAWFORD/
Homepage of James Crawford
http://ecap.crc.uiuc.edu/pubs/katzsympro.html
Clark, B. First- and second-language acquisition in early childhood.
http://members.tripod.com/~chris1066/home.html
Excellent site for novices. Explains terms, methods, theories of
SLA in simple English.