Valsala, N. (1978). apakata nivaranam vyavasayasalakalil. Kerala Bhasha Institute.
Chicago Edition CitationValsala, Neelakandhan. Apakata Nivaranam Vyavasayasalakalil. Thiruvananthapuram: Kerala Bhasha Institute, 1978.
Cita MLAValsala, Neelakandhan. Apakata Nivaranam Vyavasayasalakalil. Kerala Bhasha Institute, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.