The Effect of Using L1 (Arabic Language) in the L2 (English Language) Classroom on the Achievement in

Using the L1 in  L2/FL  Classroom

http://www.davidpublishing.com/davidpublishing/Upfile/1/22/2013/2013012285889809.PDF
The Effect of Using L1 (Arabic Language) in the L2 (English
Language) Classroom on the Achievement in General English of
Foundation Year Students in King Abdulaziz University

Other research http://www.camtesol.org/Download/LEiA_Vol3_Iss1_2012/LEiA_V3_I1_02_Timor_Use_of_the_Mother_Tongue.pdf

Read Vivian Cook
 http://utpjournals.metapress.com/content/5482v66743955633/
http://homepage.ntlworld.com/vivian.c/SLA/UsingL1talk.htm

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Using the First Language in 'the Classroom - Language Resource ...

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Vivian Cook1.