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Nickolai, D. (2017). iSpraak. Saint Louis University. https://www.ispraak.com

O’Brien, M. G. (2019). Targeting pronunciation (and perception) with technology. In N. Arnold & L. Ducate (Eds.), Engaging language learners through CALL (pp. 309–352). Sheffield, UK, and Bristol, CT: Equinox Publishing Ltd.

Thomson, R. I., & Derwing, T. M. (2015). The effectiveness of L2 pronunciation instruction: A narrative review. Applied Linguistics, 36(3), 326–344. https://doi.org/10.1093/applin/amu076