1. Alanís, Iliana. 2000. A Texas two-way bilingual program: Its effects on linguistic and academic achievement. Bilingual Research Journal 24 (3): 225–248. https://doi.org/10.1080/15235882.2000.10162763.
2. American Council for International Education. 2017. The national K-12 foreign language enrollment survey report. https://www.americancouncils.org/sites/default/files/FLE-report-June17.pdf. Accessed 16 March 2021.
3. American Council on the Teaching of Foreign Languages. 2012. ACTFL proficiency guidelines 2012. https://www.actfl.org/sites/default/files/guidelines/ACTFLProficiencyGuidelines2012.pdf. Accessed 16 March 2021.
4. American Council on the Teaching of Foreign Languages. 2015. Summary of the world-readiness standards for learning languages. https://www.actfl.org/sites/default/files/publications/standards/WorldReadinessStandardsforLearningLanguages.pdf. Accessed 16 March 2021.
5. American Council on the Teaching of Foreign Languages. 2017. NCSSFL-ACTFL can-do statements. https://www.actfl.org/publications/guidelines-and-manuals/ncssfl-actfl-can-do-statements. Accessed 16 March 2021.