Sehgal, J. L. (1992). Agro -ecological regions of India. Oxford and IBH publishing.
Chicago Style aipamenaSehgal, J L. Agro -ecological Regions of India. New Delhi: Oxford and IBH publishing, 1992.
MLA aipamenaSehgal, J L. Agro -ecological Regions of India. Oxford and IBH publishing, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.