Παραπομπή APA

John M Chalackal. (1987). Keralathile sahakarana prasthanam. State institute of languages.

Παραπομπή Chicago Style

John M Chalackal. Keralathile Sahakarana Prasthanam. Thiruvananthapuram: State institute of languages, 1987.

Παραπομπή MLA

John M Chalackal. Keralathile Sahakarana Prasthanam. State institute of languages, 1987.