1. ACTFL. (2012).ACTFL Proficiency Guidelines 2012 [electronic version]. https://www.actfl.org/uploads/files/general/ACTFLProficiencyGuidelines2012.pdf
2. ACTFL National Association for Bilingual Education National Council of State Supervisors for Languages & Teachers of English to Speakers of Other Languages International Association. (2020).Guidelines for implementing the Seal of Biliteracy [electronic version]. https://www.actfl.org/uploads/files/general/SOBL_Guidelines.pdf
3. American Councils for International Education (ACIE). (2017).The national K‐12 foreign language enrollment survey report. https://www.americancouncils.org/sites/default/files/FLE-report-June17.pdf
4. Burnet M.(2017).Signed sealed delivered: District‐level adoption of the Washington State Seal of Biliteracy[Unpublished doctoral dissertation]. University of Washington.
5. California Department of Education. (2022).State Seal of Biliteracy. https://www.cde.ca.gov/sp/el/er/sealofbiliteracy.asp