Παραπομπή APA

India. Office of the Registrar General. (1975). Census of India 1971 Series 9: Kerala. Director of Census Operations.

Παραπομπή Chicago Style

India. Office of the Registrar General. Census of India 1971 Series 9: Kerala. Kerala: Director of Census Operations, 1975.

Παραπομπή MLA

India. Office of the Registrar General. Census of India 1971 Series 9: Kerala. Director of Census Operations, 1975.