S. M. Wong, N. Sahidin, and N. Khalid, “<i>Agrobacterium</i>-mediated transformation of the aquarium plant <i>Cryptocoryne willisii </i> with <i>gus</i> and <i>gfp</i> genes”, JTA, vol. 48, no. 2, pp. 11–16, Dec. 2010.