Sukwong, Somsak, Pratuang Dhamanitayakul, and Somneuk Pongumphai. 1975. “Phenology and Seasonal Growth of Dry Dipterocarp Forest Tree Species”. Agriculture and Natural Resources 9 (2). Bangkok, Thailand:105-14. https://li01.tci-thaijo.org/index.php/anres/article/view/240716.