1. Aitchison, J. (1991). Language change: Progress or decay?Cambridge University Press.
2. American Speech-Language-Hearing-Association (1982, June). Committee on the prevention of speech, language and hearing problems. Report. ASHA, 6. 425–426.
3. American Speech-Language-Hearing Association (ASHA). (1988). Prevention of communication disorders [Position Statement]. https://www.asha.org/policy/ps1988-00228/. Accessed 5 Feb 2021.
4. American Speech-Language-Hearing Association (ASHA). (1989). Issues in determining eligibility for language intervention. Report (pp. 113–118). ASHA.
5. American Speech-Language-Hearing Association (ASHA). (2004). Knowledge and skills needed by speech-language pathologists and audiologists to provide culturally and linguistically appropriate services [Knowledge and Skills]. www.asha.org/policy. Accessed 10 Nov 2020. https://doi.org/10.1044/policy.KS2004-00215.