Siddiqui, B. S., Usmani, S. B., Begum, S., Siddiqui, S. 1994. Steroidal Constituents of Holarrhena pubescens. J. Natural Products, 57(1): 27-31.
*Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.