De Wilde, W. J., and B. E. Duyfjes. “Cucumis Sativus L. Forma Hardwickii (Royle) W.J. De Wilde & Duyfjes and Feral Forma Sativus”. Thai Forest Bulletin (Botany), no. 38, Nov. 2014, pp. 98-107, https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/24388.