Thurston, Edgar; Rangachari, K. (1909). Castes and tribes of southern India. University of California Libraries. Madras : Government Press. p. 306.{{cite book}}: CS1 maint: publisher location (link)
CM Shankaran Nair, better known as CMS Chandera., CMS Chandera (1976). വടക്കേ മലബാറിലെ പാട്ടുത്സവം [The Song Festival of Northern Kerala.] (in Malayalam). The Author. p. 10.
Innes, Charles Alexander (1997). "Peruvanian Nambiyars , Chelladan Nayars and Vennapalan Nayars . All three observe fifteen days ' pollution . The name Peruvanian means " great " or " principal oil - man and it is the duty of this caste to present the Kurumbranad Raja". Malabar Gazetteer. Kerala Gazetteers. p. 120.