Botanic Gardens Conservation International (BGCI) & IUCN SSC Global Tree Specialist Group: Cassia fistulaIUCN Red List of Threatened Species. Version 2022-1. 2018. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 9.8.2022. (englanniksi)
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Cassia fistula L. (Source: James A. Duke. 1983. Handbook of Energy Crops. unpublished.) Purdue University. Viitattu 18.5.2014.