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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিPunjab (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.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিPunjab (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.