Delpero, Walter, Barbara Robinson, and Rhona Lahey. “Evidence-Based Clinical Practice Guidelines for the Periodic Eye Exam in Children Aged 0 to 5 Years in Canada”. Canadian Journal of Optometry 81, no. 4 (November 26, 2019): 9-28. Accessed February 27, 2020. https://openjournals.uwaterloo.ca/index.php/cjo/article/view/1557.