Punjab (India). Economic and Statistical Organisation. (1973). Economics of tractor cultivation and economics of production and cultivation practices of high yielding varieties of wheat, maize (hybrid), and paddy in Punjab: Report. Economic and Statistical Organisation.
Παραπομπή σε μορφή Chicago (17η εκδ.)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: Report. Chandigarh: Economic and Statistical Organisation, 1973.
Παραπομπή σε μορφή MLA (8th εκδ.)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: Report. Economic and Statistical Organisation, 1973.