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Lo, E.; Stefanović, S.; Dickinson, T.A. (2007). "Molecular reapprasial of relationships between Crataegus and Mespilus (Rosaceae, Pyreae) – Two genera or one?". Systematic Botany. 32 (3): 596–616. doi:10.1600/036364407782250562. JSTOR25064271.
Campbell, C.S.; Evans, R.C.; Morgan, D.R.; Dickinson, T.A.; Arsenault, M.P. (2007). "Phylogeny of subtribe Pyrinae (formerly the Maloideae, Rosaceae): Limited resolution of a complex evolutionary history". Plant Systematics and Evolution. 266 (1–2): 119–145. CiteSeerX10.1.1.929.4379. doi:10.1007/s00606-007-0545-y. JSTOR23655780.
Lo, E.; Stefanović, S.; Dickinson, T.A. (2007). "Molecular reapprasial of relationships between Crataegus and Mespilus (Rosaceae, Pyreae) – Two genera or one?". Systematic Botany. 32 (3): 596–616. doi:10.1600/036364407782250562. JSTOR25064271.
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Campbell, C.S.; Evans, R.C.; Morgan, D.R.; Dickinson, T.A.; Arsenault, M.P. (2007). "Phylogeny of subtribe Pyrinae (formerly the Maloideae, Rosaceae): Limited resolution of a complex evolutionary history". Plant Systematics and Evolution. 266 (1–2): 119–145. CiteSeerX10.1.1.929.4379. doi:10.1007/s00606-007-0545-y. JSTOR23655780.