Laumakis, Mark, Charles Graham, and Chuck Dziuban. “THE SLOAN-C PILLARS AND BOUNDARY OBJECTS AS A FRAMEWORK FOR EVALUATING BLENDED LEARNING”. Online Learning 13, no. 1 (March 1, 2009). Accessed July 28, 2026. https://olj.onlinelearningconsortium.org/index.php/olj/article/view/1679.