APA
INDIA P. A. P. I. (. o., INDIA P. A. P. I. (. o., . (1998). National industrial classification (All economic activities). New Delhi: Govt of India.
Chicago
INDIA PLANNING AND PROGRAMME IMPLEMENTATION (Ministry of-), INDIA PLANNING AND PROGRAMME IMPLEMENTATION (Ministry of-), . 1998. National industrial classification (All economic activities). New Delhi: Govt of India.
Harvard
INDIA P. A. P. I. (. o., INDIA P. A. P. I. (. o., . (1998). National industrial classification (All economic activities). New Delhi: Govt of India.
MLA
INDIA PLANNING AND PROGRAMME IMPLEMENTATION (Ministry of-), INDIA PLANNING AND PROGRAMME IMPLEMENTATION (Ministry of-), . National industrial classification (All economic activities). New Delhi: Govt of India. 1998.
