Aditi Singhal Singhal Sudhir Kishore Bala <br/><br/>
How to Improve Concentration: by guinness world record holders 

 - Gurgaon  Penguin random House  2020 
 - xii, 212p. 
<br/><br/><label>ISBN: </label>9780143427520 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Attention<br/>Concentration<br/>Psychology<br/>Self Help
<br/><br/><label>Dewey Class. No.: </label>153.733  / ADI/H