Saensouk, P. ., and S. Saensouk. “Pollen Morphology of Helicteres (Malvaceae s.L.) from Thailand”. Agriculture and Natural Resources, vol. 54, no. 4, Aug. 2020, pp. 351–354, https://li01.tci-thaijo.org/index.php/anres/article/view/247950.