Sita Ram Singh. (1986). Technological parameters in agricultural production fucntion. Ashish Pub.house.
Chicago Style aipamenaSita Ram Singh. Technological Parameters in Agricultural Production Fucntion. Delhi: Ashish Pub.house, 1986.
MLA aipamenaSita Ram Singh. Technological Parameters in Agricultural Production Fucntion. Ashish Pub.house, 1986.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.