1. Abadin H. Fried D. Good G. &Surface E.(2012).Reliability study of the ACTFL OPI in Chinese Portuguese Russian Spanish German and English for the ACE review. Raleigh NC: SWA Consulting Inc.
2. ACTFL. (2012).ACTFL proficiency guidelines 2012.https://www.actfl.org/sites/default/files/guidelines/ACTFLProficiencyGuidelines2012.pdf
3. ACTFL. (2020a).2019 annual report.https://www.actfl.org/sites/default/files/reports/annualreport2019/index.html
4. ACTFL. (2020b).ACTFL OPIc examinee handbook.https://www.languagetesting.com/pub/media/wysiwyg/manuals/opic-examinee-handbook.pdf
5. ACTFL. (2021).2020 annual report. https://www.actfl.org/sites/default/files/reports/annualreport2020/index.html