Sayampol, N. and Changsalak, S. (1999) “Increasing Profit to Maize-Cotton Planting System with Intercrop”, Agriculture and Natural Resources. Bangkok, Thailand, 33(1), pp. 1–9. available at: https://li01.tci-thaijo.org/index.php/anres/article/view/240422 (accessed: 17 September 2026).