Gopalakrishnan, Naduvattom  <br/><br/>
Gaveshana Reethi Sasthram / 
Naduvattom Gopalakrishnan 
 - 3rd ed. 
 - Thiruvananthapuram:  The State Institute of Languages,  2019. 
 - 88p. 
<br/><br/><label>ISBN: </label>9788120047785 
<br/><br/><label>Dewey Class. No.: </label>894.8128  / GOP/G