1. Bright Futures (an AAP Publication), 4th edition. 2019. “Guidelines for Health Supervision of Infants, Children, and Adolescents.”
https://brightfutures.aap.org/Bright%20Futures%20Documents/BF4_POCKETGUIDE.pdf
[Accessed December 2020]

2. Helpful Professor. 2020. “Parten’s 6 Stages of Play in Childhood, Explained! (2020).”
https://helpfulprofessor.com/stagesofplay/
[Accessed December 2020]