APA (7th ed.) Citation

Gupta, O. P., & Lamba, P. S. (1978). Modern weed science in the tropics and sub-tropics. Today and Tomorrow's Printers & Publishers.

Chicago Style (17th ed.) Citation

Gupta, O. P., and P. S. Lamba. Modern Weed Science in the Tropics and Sub-tropics. New Delhi: Today and Tomorrow's Printers & Publishers, 1978.

MLA (9th ed.) Citation

Gupta, O. P., and P. S. Lamba. Modern Weed Science in the Tropics and Sub-tropics. Today and Tomorrow's Printers & Publishers, 1978.