Healthline. https://www.healthline.com/health/language-delay#outlook
Diakses pada 16 Mei 2020Healthline. https://www.healthline.com/health/speech-delay-3-year-old-2#diagnosis
Diakses pada 16 Mei 2020.Kidshealth. https://kidshealth.org/Nemours/en/parents/not-talk.html
Diakses pada 17 Mei 2020.Verywellfamily. https://www.verywellfamily.com/causes-of-toddler-speech-delays-289665
Diakses pada 16 Mei 2020.