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https://www.longdom.org/open-access/the-phonological-development-process-in-early-childhood.pdf The Phonological Development Process in Early Childhood phonological development process in early childhood https://www.york.ac.uk/language-linguistic-science/current-students-staff/current/undergraduates/modules/2015-16/l24h/ Phonological development (L24H) - Department of Language and Linguistic Science, University of York phonological development department of linguistic science