Gallagher, T. L., X. Fazio, and K. Ciampa. “A Comparison of Readability in Science-Based Texts: Implications for Elementary Teachers”. Canadian Journal of Education/Revue Canadienne De l’éducation, Vol. 40, no. 1, Mar. 2017, pp. 1-29, https://journals.sfu.ca/cje/index.php/cje-rce/article/view/2227.