Siriwattananon, N. “The construction and performance testing of Indian gooseberry (Phyllanthus emblica) tapping machine with crank mechanism”. RMUTSB ACADEMIC JOURNAL, vol. 8, no. 2, Dec. 2020, pp. 215-26, https://li01.tci-thaijo.org/index.php/rmutsb-sci/article/view/242250.