Your Child at 9: Milestones. https://www.webmd.com/parenting/guide/child-9-milestones
Middle Childhood (9-11 years of age). https://www.cdc.gov/ncbddd/childdevelopment/positiveparenting/middle2.html
Young Teens (12-14 years of age). https://www.cdc.gov/ncbddd/childdevelopment/positiveparenting/adolescence.html
Ages and Stages of Development https://www.cde.ca.gov/sp/cd/re/caqdevelopment.asp
Mental illness in children: Know the signs. https://www.mayoclinic.org/healthy-lifestyle/childrens-health/in-depth/mental-illness-in-children/art-20046577. Accessed February 17, 2022
https://www.rama.mahidol.ac.th/ramamental/generalknowledge/child/06242014-1920. Accessed February 17, 2022
สภาพจิตใจของวัยรุ่น. https://www.rama.mahidol.ac.th/ramamental/generaldoctor/06062014-0847. Accessed February 17, 2022
Childhood Schizophrenia. https://www.webmd.com/schizophrenia/childhood-schizophrenia. Accessed February 17, 2022
Depression in children and young people. https://www.nhs.uk/mental-health/children-and-young-adults/advice-for-parents/children-depressed-signs/. Accessed February 17, 2022
Anxiety disorders in children. https://www.nhs.uk/mental-health/children-and-young-adults/advice-for-parents/anxiety-disorders-in-children/. Accessed February 17, 2022