B. Leung, C. ., W. S. . Lang, and S. . C. Schaller. “Rasch Modeling to Drive Instruction of Content Area Concepts and Vocabulary: An Example from Secondary Economics Instruction With Special Needs Students”. International Journal of Learning, Teaching and Educational Research, vol. 16, no. 12, Dec. 2017, pp. 70-86, http://www.ijlter.net/index.php/ijlter/article/view/764.