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AAP. 2015. Language developmental: 2 year olds. American Academy of Pediatrics. https://www.healthychildren.org/English/ages-stages/toddler/Pages/Language-Development-2-Year-Olds.aspx [Accessed August 2016]
CDC. 2016. Important milestones: Your child at two years. U.S. Centers for Disease Control and Prevention. http://www.cdc.gov/ncbddd/actearly/milestones/milestones-2yr.html [Accessed August 2016]
Mayo Clinic. 2016. Should I be concerned that my 2-year-old doesn’t say many words and is hard to understand? http://www.mayoclinic.org/healthy-lifestyle/infant-and-toddler-health/expert-answers/toddler-speech-development/faq-20057847 [Accessed August 2016]
MedlinePlus (ADAM). 2016. Developmental milestones record—2 years. https://medlineplus.gov/ency/article/002012.htm [Accessed August 2016]
Zero to Three. 2010. Language and literacy skills from 24–36 months. National Center for Infants, Toddlers, and Families. https://www.zerotothree.org/resources/1289-language-and-literacy-skills-from-24-36-months [Accessed August 2016]