Sukumar. (1982). Koothambalam. Sahitya Pravarthaka Sahakarana Sangam.
Chicago Edition CitationSukumar. Koothambalam. Kottayam: Sahitya Pravarthaka Sahakarana Sangam, 1982.
MLA Edition CitationSukumar. Koothambalam. Sahitya Pravarthaka Sahakarana Sangam, 1982.
Warning: These citations may not always be 100% accurate.