Παραπομπή APA

Graff, H. (1976). Irumpurukku Vyavasayam. State Institute of languages.

Παραπομπή Chicago Style

Graff, Heinz. Irumpurukku Vyavasayam. Trivandrum: State Institute of languages, 1976.

Παραπομπή MLA

Graff, Heinz. Irumpurukku Vyavasayam. State Institute of languages, 1976.