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(EN) D. D. Petersen, Common plant toxicology: a comparison of national and Southwest Ohio data trends on plant poisonings in the 21st century. (abstract), in Toxicology and Applied Pharmacology, vol. 2, n. 254, Cincinnati, Elsevier, 2011, pp. 148-153, DOI:10.1016/j.taap.2010.10.022.
Crassula ovata, su PlantZAfrica.com. URL consultato l'8 dicembre 2020.
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(EN) D. D. Petersen, Common plant toxicology: a comparison of national and Southwest Ohio data trends on plant poisonings in the 21st century. (abstract), in Toxicology and Applied Pharmacology, vol. 2, n. 254, Cincinnati, Elsevier, 2011, pp. 148-153, DOI:10.1016/j.taap.2010.10.022.