Smith, P. Sean, Peggy J. Trygstad, and Eric R. Banilower. “Widening the Gap: Unequal Distribution of Resources for K–12 Science Instruction”. Education Policy Analysis Archives 24 (January 24, 2016): 8. Accessed July 17, 2024. https://epaa.asu.edu/index.php/epaa/article/view/2207.