വിശ്വവിജ്ഞാനകോശം .Vol.1-Vol.10.Visvavijnanakosham.Vol.1-Vol.10. 
 Malayalam Encyclopaedia. 

 - Kottayam :  Sahitya pravarthaka cooperative society  1970. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Encyclopaedia.
<br/><br/><label>Dewey Class. No.: </label>039.948   / VIS