Hang, Sun; McLewin, Will; Fay, Michael F. (2001). "Molecular Phylogeny of Helleborus (Ranunculaceae), with an Emphasis on the East Asian-Mediterranean Disjunction". Taxon. 50 (4): 1001–18. doi:10.2307/1224717. JSTOR1224717.
Hang, Sun; McLewin, Will; Fay, Michael F. (2001). "Molecular Phylogeny of Helleborus (Ranunculaceae), with an Emphasis on the East Asian-Mediterranean Disjunction". Taxon. 50 (4): 1001–18. doi:10.2307/1224717. JSTOR1224717.
missouribotanicalgarden.org
"Helleborus orientalis". Plant Finder. Missouri Botanic Garden. Archived from the original on 6 January 2018. Retrieved 6 January 2018.