Browicz, K. 1993: Conspect and chorology of the genus Pyrus L. – Arbor. Kornickie. 38: 17- 33.
Browicz, K., 1973. Distribution of woody Rosaceae in W. Asia XII. Miscellaneous notes. -Arbor. Kornick. Rocznik, XVIII: 23‒33.
Cuizhi, C. & Spongberg, S. A. 2003: Pyrus in Flora of China 9: 173- 179.
Khatamsaz, M. 1992: Pyrus in Assadi & al. Flora of Iran, no. 6: 181-200.- Research Institute of Forests and rangelands, Tehran.
Schönbeck- Temesy, E. 1969: Pyrus in Rechinger K.H. (ed.) Flora Iranica 66: 27- 36.- Graz, Austria: Akademische Druck- und Verlagsanstalt.
)
