Bibliography (8):

1. https://www.tn.gov/education/early-learning/voluntary-pre-k.html

2. ​ The Iron Law Of Evaluation And Other Metallic Rules

3. Effects of a statewide pre-kindergarten program on children’s achievement and behavior through sixth grade

4. Investing in Preschool Programs

5. Elusive Longer-Run Impacts of Head Start: Replications Within and Across Cohorts

6. Preschool: Much More Than You Wanted To Know

7. Wikipedia Bibliography:

   1. Randomized controlled trial

   2. https://en.wikipedia.org/wiki/Pre-kindergarten  :

      https://en.wikipedia.org/wiki/Pre-kindergarten