Vijayalakshmi, P. C. ., & Shailaja, M. K. V. . (2012). Development of a Training Package in School Mathematics (DTPSM) for Pre-Service and In-Service Teachers. INDIAN EDUCATIONAL REVIEW, 50(2), p. 111-115. http://ejournals.ncert.gov.in/index.php/ier/article/view/2558