Hasan, M. N., M. Ahsan, C. M. Hasan, and A. Z. Azam. ā€œ4-Benzoquinone and Stigmasterol from Heliotropium Indicum Lā€. Dhaka University Journal of Pharmaceutical Sciences, vol. 15, no. 1, Aug. 2016, pp. 113-5, doi:10.3329/dujps.v15i1.29205.