Im-emkamo, J. and Krutkum, T. (1976) “Soil Aggregation of the Kamphaeng Saen Soil Series”, Agriculture and Natural Resources. Bangkok, Thailand, 10(1), pp. 42–50. available at: https://li01.tci-thaijo.org/index.php/anres/article/view/240729 (accessed: 18 September 2026).