Haque, M. E., A. Rahman, A. Amin, and H. U. Shekher. “Alkamide and Lignan from the Stem Bark of Piper Chaba (Piperaceae)”. Dhaka University Journal of Pharmaceutical Sciences, vol. 3, no. 1, June 2007, doi:10.3329/dujps.v3i1.187.