Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.

The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.

Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.

McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.

Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.

Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.

Williamson EM, Evans FJ, eds. Potter's New Cyclopaedia of Botanical Drugs and Preparations. Essex, England: CW Daniel Company Ltd., 1998.

Foster S, Tyler VE. Tyler's Honest Herbal, 4th ed., Binghamton, NY: Haworth Herbal Press, 1999.

Electronic Code of Federal Regulations. Title 21. Part 182 -- Substances Generally Recognized As Safe. Available at: https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=182

Sifton D, ed. The PDR family guide to natural medicines & healing therapies. New York, NY:Three Rivers Press, 1999.

Weiner MA, Weiner JA. Herbs that heal: prescription for herbal healing. Mill Valley, CA:Quantum Books, 1999.

Salman HA, Venkatesh S, Senthilkumar R, Gnanesh Kumar BS, Ali AM. Determination of antibacterial activity and metabolite profile of Ruta graveolens against Streptococcus mutans and Streptococcus sobrinus. J Lab Physicians. 2018;10(3):320-5. View abstract.

Radotra I, Gardiner S, Barnes D. A phytophototoxic injury at a burns unit: the ungraceful after-effects of the "common rue" plant. J Burn Care Res. 2018;39(6):1064-6. View abstract.

Avallone G, Mastorino L, Agostini A, et al. Ruta graveolens phytophotodermatitis. Dermatol Online J 2021;27(7). View abstract.