1. Shahbaz, S.: Trees and shrubs, a field guide to the trees and shrubs of Kurdistan region of Iraq. Univ. Duhok. (2010)
2. Chapman, G.: Notes on forestry in Iraq. Emp. Forest. Rev. 132–135 (1950)
3. Şefik, Y.: Forests of Iraq. J. Fac. Forest. Istanbul Univ. 31(1) (1981)
4. Nasser, M.: Forests and forestry in Iraq: prospects and limitations. Commonw. Forest. Rev. 299–304 (1984)
5. Therrell, M.D., Stahle, D.W., Ries, L.P., Shugart, H.H.: Tree-ring reconstructed rainfall variability in Zimbabwe. Clim. Dyn. 26(7–8), 677 (2006)