Abel, J., Allen, B., Burton, S., Kazama, M., Kim, B., Noguchi, M., Tsuda, A., Yamane, N., & Gick, B. (2015). Ultrasound-Enhanced Multimodal Approaches to Pronunciation Teaching and Learning. Canadian Acoustics, 43(3). Retrieved from https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2805