India. Ministry of Communications. (1972). Report. Ministry of Communications, Govt. of India.
Chicago-referens (17:e uppl.)India. Ministry of Communications. Report. New Delhi: Ministry of Communications, Govt. of India, 1972.
MLA-referens (8:e uppl.)India. Ministry of Communications. Report. Ministry of Communications, Govt. of India, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.