1. Fatal oleander poisoning;Ansford;Med J Aust,1981
2. Are holly berries toxic?;Arena;JAMA,1979
3. Martindale Extra Pharmacopoia;Blacow,1972
4. Comfrey. Lawrence Review of Natural Products, 3:89, 1982.
5. Poisoning by the volatile oils in childhood;Craig;Arch Dis Child,1953