Talent, N.; Dickinson, T.A. (2005). "Polyploidy in Crataegus and Mespilus (Rosaceae, Maloideae): evolutionary inferences from flow cytometry of nuclear DNA amounts". Canadian Journal of Botany. 83 (10): 1268–1304. doi:10.1139/b05-088.
anonymous. "Hawthorns". mo.gov. Archived from the original on 15 September 2015. Retrieved 12 September 2015.
usda.gov
plants.sc.egov.usda.gov
USDA, NRCS (n.d.). "Crataegus punctata". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 17 January 2016.