Q. B. Han; S. L. Li; C. F. Qiao; J. Z. Song; Z. W. Cai; P. Pui-Hay But; P. C. Shaw & H. X. Xu (2008). "A simple method to identify the unprocessed Strychnos seeds used in herbal medicinal products". Planta Medica. 74 (4): 458–463. doi:10.1055/s-2008-1034359. PMID18484543.
Q. B. Han; S. L. Li; C. F. Qiao; J. Z. Song; Z. W. Cai; P. Pui-Hay But; P. C. Shaw & H. X. Xu (2008). "A simple method to identify the unprocessed Strychnos seeds used in herbal medicinal products". Planta Medica. 74 (4): 458–463. doi:10.1055/s-2008-1034359. PMID18484543.
USDA, NRCS (n.d.). "Strychnos nux-vomica". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 4 December 2015.