Vishnu Narayanan Namboodiri. (1987). Pranayageethangal. Sahitya Pravartaka Co-operative Society.
Dyfyniad Arddull ChicagoVishnu Narayanan Namboodiri. Pranayageethangal. Kottayam: Sahitya Pravartaka Co-operative Society, 1987.
Dyfyniad MLAVishnu Narayanan Namboodiri. Pranayageethangal. Sahitya Pravartaka Co-operative Society, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.