Rastrye Pathyacharya ki Ruprekha 2005 : Ganit Shikshan 1. 2
Yadav, Naresh ed.
Rastrye Pathyacharya ki Ruprekha 2005 : Ganit Shikshan 1. 2 - New Delhi N. C. E. R. T. 2008 - p.21
Rastrye Pathyacharya ki Ruprekha 2005 : Ganit Shikshan 1. 2 - New Delhi N. C. E. R. T. 2008 - p.21