Tham, N. T., Laosinwattana, C., Teerarak, M., and Sripinyowanich, S., “Study on DNA degradation by natural herbicide from Tagetes erecta L. during Amaranthus spp seed germination”, Int. J. Agric. Tech., vol. 12, no. 6, pp. 1005–1015, Nov. 2016.