Tachatoe, S., and O. Rurgnoi. “Direct Shoot Bud Formation and Plantlet Regeneration from Culturing Leaf Discs of Neem (Azadirachta excelsa L.)”. Agriculture and Natural Resources, vol. 33, no. 4, Dec. 1999, pp. 486-9, https://li01.tci-thaijo.org/index.php/anres/article/view/240401.