Sanchayan: Bhag 1, kaksha 9 ke liye hindi 'B' (Diwtiya bhasha) ki purak patthya pushtak 
NCERT. New Delhi 
 - Dehradun, India  Kendriya Braille Press   2009 
<br/><br/><br/>Braille books 
<br/><br/><label>Source: </label>TextBook