Petchang, R. (2010) “Diversity and Conservation of Orchids Along the Ecological Tourism Route of Lum-Nam Nan and Klongtron National Park, Uttaradit”, Asian Health, Science and Technology Reports, 18(2), pp. 1–8. available at: https://ph03.tci-thaijo.org/index.php/ahstr/article/view/2309 (accessed: 30 August 2026).