Chareinsak Rojanaridpiched, Piyavuth Pulsanguan, Somyod Phuddachareon, Jamlong Jeamjamnanja, and Witthaya Saengkaewsook. “Study on Planting Season of Cassava”. Agriculture and Natural Resources, vol. 21, no. 2, June 1987, pp. 119-25, https://li01.tci-thaijo.org/index.php/anres/article/view/242590.