Boyson, B. A., Semmer, M., Thompson, L. E., & Rosenbusch, M. H. (2013). Does beginning foreign language in kindergarten make a difference? Results of one district's study. Foreign Language Annals, 46(2), 246-263.
Clementi, D., & Terrill, L. (2013). The keys to planning for learning: Effective curriculum, unit, and lesson design. Alexandria, VA: ACTFL.
Kagan, O., & Dillon, K. (2004). Heritage speakers' potential for high-level language proficiency. Advanced foreign language learning: A challenge to college programs, 99-112.
Malone, M. E., Rifkin, B., Christian, D., & Johnson, D. E. (2003, January). Attaining high levels of proficiency: Challenges for language education in the United States. In Proceedings Conference on Global Challenges and US Higher Education.
The National Standards Collaborative Board. (2015). World-readiness standards for learning languages. Alexandria, VA: Author. (See: http://standards4languages.org )
Thorne, S. L., & Reinhardt, J. (2008). Bridging activities, new media literacies, and advanced foreign language proficiency. Calico Journal, 25(3), 558-572.