1. Collaborative for Academic, Social, and Emotional Learning (CASEL) (2020). What Is SEL. https://casel.org/casel-sel-framework-11-2020
2. Using the universal design for learning framework to plan for all students in the classroom: Representation and visual support;Mrachka;The Elementary STEM Journal,2020
3. Hartup, W.W. (1992). Having Friends, Making Friends, and Keeping Friends: Relationships as educational contexts (Monograph). https://files.eric.ed.gov/fulltext/ED345854.pdf
4. Collaborative for Academic, Social, and Emotional Learning (CASEL) (n.d.). What Is the CASEL Framework? A framework creates a foundation for applying evidence-based SEL strategies to your community. https://casel.org/fundamentals-of-sel/what-is-the-casel-framework