Evans, R. C.; Campbell, C. S. (2002). "The origin of the apple subfamily (Maloideae; Rosaceae) is clarified by DNA sequence data from duplicated GBSSI genes". American Journal of Botany. 89 (9): 1478–1484. doi:10.3732/ajb.89.9.1478. PMID21665749.
Evans, R. C.; Campbell, C. S. (2002). "The origin of the apple subfamily (Maloideae; Rosaceae) is clarified by DNA sequence data from duplicated GBSSI genes". American Journal of Botany. 89 (9): 1478–1484. doi:10.3732/ajb.89.9.1478. PMID21665749.