S. Valencia Avalos, Nixon, K. C., and Kelly, L. M., ?Quercus delgadoana (Fagaceae), a New Species from the Sierra Madre Oriental, Mexico?, Novon: A Journal for Botanical Nomenclature, vol. 21, pp. 274?277, 2011.

J. R.  Bacon, Dávila-Aranda, P. Dolores, Spellenberg, R., and M. González-Elizondo, S., ?The taxonomic status of the Mexican oak Quercus undata (Fagaceae, Quercus, section Quercus)?, Revisita Mexicana de Biodiversidad, vol. 82, pp. 1123-1131, 2011.

Y.  Aykut, Uslu, E., and M. Babaç, T., ?Cytogenetic studies on Quercus L. (Fagaceae) species belonging to Ilex and Cerris section in Turkey?, CaryologiaCaryologia, vol. 64, pp. 297-301, 2011.