D. L. Sehgal, K. L. Chopra, . (1991). Electricity & Magnetism. New Delhi: Sultan Chand &Sons.
D. L. Sehgal, K. L. Chopra, . 1991. Electricity & Magnetism. New Delhi: Sultan Chand &Sons.
D. L. Sehgal, K. L. Chopra, . Electricity & Magnetism. New Delhi: Sultan Chand &Sons. 1991.