แหล่งข้อมูลอ้างอิง

http://www.baanjomyut.com/library_2/extension-1/concepts_of_developmental_psychology/01_3.html

https://sites.google.com/a/srp.ac.th/development-theory/thvsdi-phathnakar-tha-ngbukhlk-phaph/thvsdi-cit-wi-kheraah-khxng-f-rxy-d

https://childhood281.blogspot.com/2010/01/blog-post_23.html?fbclid=IwAR2oU0UDCf3LKlavwSke1F41uPb2yoAo9yE6x9d4vuyhEKE39XYII4kvd1s

http://nukjit.blogspot.com/2015/12/blog-post_82.html

https://youtu.be/P58z6EJSmBI