1. Beakley , B. A. Yoder , S. L. West , L. 2003 Community-based instruction: A guidebook for teachers http://www.cec.sped.org
2. Berry , E. Williams , M. S. 1992 Multilevel ESL curriculum guide
3. Mass media, marketing, critical mass and other mechanisms of linguistic maintenance;Carreira;Southwest Journal of Linguistics,2002
4. 4. Teaching Spanish in the U.S.