Heller, D. 1982: Trifolium in K.H. Rechinger, Flora Iranica (PapilionaceaeII). no. 157: 275-325. -Graz.
Townsend, C.C. 1974: Trifolium in C.C. Townsend & Evan Guest Flora of Iraq, vol. 3: 150-196. - Baghdad.
Zohary, M. & Heller D. 1984: The GenusTrifolium. -The Israel Academy of Sciences and Humanities, Jerusalem.
Zohary, M. 1969: Trifolium in P.H. Davis Flora of Turkey and the East Aegean islands. vol. 3: 384-448. -Edinburgh University Press.
)
