Kelly-Vance, Lisa, Angela Caster, and Amy Ruane. “Nongraded Versus Graded Elementary Schools: An Analysis of Achievement and Social Skills”. Alberta Journal of Educational Research 46, no. 4 (December 1, 2000). Accessed November 21, 2024. https://dev.journalhosting.ucalgary.ca/index.php/ajer/article/view/54832.