1. V.
Nikolić
, Heracleum L., in Flora of Republic of Serbia, ed. M. Josifović, Serbian Academy of Sciences and Arts, Belgrade, 5th edn, 1973, pp. 308–313
2. T. G.
Tutin
, Laserpitium L., in Flora Europaea, ed. V. H. Heywood, N. A. Burges, D. M. Moore, D. H. Valentine, S. M. Walters and D. A. Webb, Cambridge University Press, Cambridge, 2nd edn, 1968, pp. 368–370
3. K.
Micevski
, Heracleum L., in Flora of Republic of Macedonia, ed. V. Matevski, Macedonian Academy of Sciences and Arts, Skopje, 6th edn, 2005, pp. 1637–1640
4. G.
Amin
, Popular Medicinal Plants of Iran, Tehran University of Medical Sciences Press, Tehran, 2008, p. 130
5. Four Coumarins from Heracleum yunngningense