Herrelko, Janet M. “How Employing DuFour’s Professional Learning Community Guidelines Impacted a Mathematics Professional Learning Community”. International Journal of Learning, Teaching and Educational Research 15, no. 11 (October 30, 2016): 111–127. Accessed August 20, 2026. http://www.ijlter.myres.net/index.php/ijlter/article/view/878.