Ohnmar Khaing, Praparat Hormchan, Surachrat Jamornmarn, Ngarmchuen Ratanadilok and Arunee Wongpiyasatid (2002) “Spatial Dispersion and Optimum Sample Size for Cotton Bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) Larvae on Cotton”, Agriculture and Natural Resources. Bangkok, Thailand, 36(3), pp. 235–241. available at: https://li01.tci-thaijo.org/index.php/anres/article/view/242723 (accessed: 27 August 2026).