D. P. Khandelwal, . (1999). Optics & Atomic Physics. New Delhi: Himalaya Pub House.
D. P. Khandelwal, . 1999. Optics & Atomic Physics. New Delhi: Himalaya Pub House.
D. P. Khandelwal, . Optics & Atomic Physics. New Delhi: Himalaya Pub House. 1999.