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Social & Emotional Development Milestones for Toddlers (1-3 Years) State of Michigan (2025), https://www.michigan.gov/mikidsmatter/parents/toddler/social 

Social-Emotional Development: Milestones Virtual Lab School (2023), https://www.virtuallabschool.org/management/social-and-emotional-development/lesson-2 

Strategies for Self-Regulation Kids First (2025), https://www.kidsfirstservices.com/first-insights/strategies-for-self-regulation#:~:text=Understanding%20Self%2DRegulation,academic%20performance%2C%20and%20interpersonal%20relationships.