Punjab (India). Economic and Statistical Organisation. (1974). Economics of tractor cultivation and economics of production and cultivation practices of high yielding varieties of wheat, maize (hybrid), and paddy in Punjab: Combined report from 1969-70 to 1971-72. The Organization.
Chicago-referens (17:e uppl.)Punjab (India). Economic and Statistical Organisation. Economics of Tractor Cultivation and Economics of Production and Cultivation Practices of High Yielding Varieties of Wheat, Maize (hybrid), and Paddy in Punjab: Combined Report from 1969-70 to 1971-72. Chandigarh: The Organization, 1974.
MLA-referens (8:e uppl.)Punjab (India). Economic and Statistical Organisation. Economics of Tractor Cultivation and Economics of Production and Cultivation Practices of High Yielding Varieties of Wheat, Maize (hybrid), and Paddy in Punjab: Combined Report from 1969-70 to 1971-72. The Organization, 1974.