Kawasaki-Knight, L., K. S. Wolgemuth, and B. J. Becerra. “Integrated Approach on the Acquisition of Phonological Targets in 4-to-6-Year-Old Children”. Journal of Child Language Acquisition and Development-JCLAD, Aug. 2021, pp. 249-83, https://science-res.com/index.php/jclad/article/view/28.