Phipps, J.B. (2016)

Studies in Mespilus, Crataegus, and ×Crataemespilus (Rosaceae), II. The academic and folk taxonomy of the medlar, Mespilus germanica, and hawthorns, Crataegus (Rosaceae)

. Phytotaxa 260 (1): 25–35. https://doi.org/10.11646/phytotaxa.260.1.3