Bayer, R. J., Bogle, A. L. & Cherniawsky, D. M. 2006: Petasites Miller in Flora of North America Editorial Committee (ed.), Flora of North America and North of Mexico. 20. part 2: 635-640.
Matthews, V. A. 1982: Petasites in P. H. Davis (ed.) Flora of Turkey, vol. 5: 169-170. -Edinburgh.
Rechinger, K. H. 1989: Petasites in K. H. Rechinger Flora Iranica, no. 164: 43. -Graz.
Toman, J. 1972: A taxonomic survey of the genera Petasites and Endocellion. –Folia Geobot. Phytotax vol. 7, no. 4: 381-406.