1. ACTFL. (2010). Language learning for heritage and native speakers.https://www.actfl.org/news/position-statements/language-learning-heritage-and-native-speakers
2. ACTFL. (2012). ACTFL proficiency guidelines.www.actfl.org/publications/guidelines-and-manuals/actfl-proficiency-guidelines-2012
3. ACTFL & CAEP. (2013). Program standards for the preparation of foreign language teachers.https://www.actfl.org/sites/default/files/CAEP/ACTFLCAEPStandards2013_v2015.pdf