1. Institute for Education Sciences, National Center for Education Statistics. Public school enrollment in grades 9 through 12, by region, state, and jurisdiction: selected years, fall 1990 through fall 2029. Digest of Education Statistics. https://nces.ed.gov/programs/digest/d19/tables/dt19_203.30.asp. Published December, 2019. Accessed January 11, 2023.
2. Institute for Education Sciences, National Center for Education Statistics. Private elementary and secondary school enrollment, percentage distribution of private school enrollment, and private enrollment as a percentage of total enrollment in public and private schools, by school orientation and grade: selected years, fall 1999 through fall 2019. Digest of Education Statistics. https://nces.ed.gov/programs/digest/d21/tables/dt21_205.15.asp. Published October 2021. Accessed January 11, 2023.
3. Institute for Education Sciences, National Center for Education Statistics. Average number of hours in the school day and average number of days in the school year for public schools, by state; 2007–08. School and Staffing Survey. https://nces.ed.gov/surveys/sass/tables/sass0708_035_s1s.asp. Accessed January 11, 2023.
4. Youth Risk Behavior Survey Data Summary and Trends Report: 2009–2019,2020
5. A comprehensive technical package for the prevention of youth violence and associated risk behaviors;David-Ferdon,2016