Glenn, Steven D. (2013). "Ilex verticillata". New York Metropolitan Flora Project. Brooklyn Botanic Garden. Archived from the original on 2017-12-25. Retrieved 2007-11-27.
USDA, NRCS (n.d.). "Ilex verticillata". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 2011-11-01.
uwa.edu
atlas.uwa.edu
"Ilex verticillata". Alabama Plant Atlas. Alabama Herbarium Consortium & the University of West Alabama. Retrieved 2018-09-01.
Glenn, Steven D. (2013). "Ilex verticillata". New York Metropolitan Flora Project. Brooklyn Botanic Garden. Archived from the original on 2017-12-25. Retrieved 2007-11-27.