Proehl, Rebecca A., Shelese Douglas, Dean Elias, Anthony H. Johnson, and Wendy Westsmith. 2013. “A Collaborative Approach: Assessing the Impact of Multi-Grade Classrooms”. Catholic Education: A Journal of Inquiry and Practice 16 (2), 417-40. https://ejournals.bc.edu/index.php/cej/article/view/1943.