Graff, H. (1976). Irumpurukku Vyavasayam. State Institute of languages.
Chicago Edition CitationGraff, Heinz. Irumpurukku Vyavasayam. Trivandrum: State Institute of languages, 1976.
MLA Edition CitationGraff, Heinz. Irumpurukku Vyavasayam. State Institute of languages, 1976.
Warning: These citations may not always be 100% accurate.