Challappan Nair. N. P. (1975). Kathakal, Karyangal, Kathayillaymakal. N.B.S.
Chicago Style aipamenaChallappan Nair. N. P. Kathakal, Karyangal, Kathayillaymakal. Kottayam: N.B.S, 1975.
MLA aipamenaChallappan Nair. N. P. Kathakal, Karyangal, Kathayillaymakal. N.B.S, 1975.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.