National Symposium on "Approach to Higher Productivity of Crops" Calcutta, India, Das Gupta, D. K., & Chattopadhyay, N. C. (1980). Higher productivity in agriculture: Proceedings of the National Symposium on "Approach to Higher Productivity of Crops" held at the Ramakrishna Mission Institute of Culture, Calcutta, during May 19-20, 1978. Oxford & IBH.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)National Symposium on "Approach to Higher Productivity of Crops" Calcutta, India, Dilip Kumar Das Gupta, và N. C. Chattopadhyay. Higher Productivity in Agriculture: Proceedings of the National Symposium on "Approach to Higher Productivity of Crops" Held at the Ramakrishna Mission Institute of Culture, Calcutta, During May 19-20, 1978. New Delhi: Oxford & IBH, 1980.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)National Symposium on "Approach to Higher Productivity of Crops" Calcutta, India, et al. Higher Productivity in Agriculture: Proceedings of the National Symposium on "Approach to Higher Productivity of Crops" Held at the Ramakrishna Mission Institute of Culture, Calcutta, During May 19-20, 1978. Oxford & IBH, 1980.