Denk, Thomas; Grimm, Guido; Stogerer, K.; Langer, M.; Hemleben, Vera (2002). "The evolutionary history of Fagus in western Eurasia: Evidence from genes, morphology and the fossil record". Plant Systematics and Evolution. 232 (3–4): 213–236. doi:10.1007/s006060200044. JSTOR23644392. S2CID33581227.
Manchester, S. R.; Dillhoff, R. M. (2004). "Fagus (Fagaceae) fruits, foliage, and pollen from the Middle Eocene of Pacific Northwestern North America". Canadian Journal of Botany. 82 (10): 1509–1517. doi:10.1139/b04-112.
Denk, Thomas; Grimm, Guido; Stogerer, K.; Langer, M.; Hemleben, Vera (2002). "The evolutionary history of Fagus in western Eurasia: Evidence from genes, morphology and the fossil record". Plant Systematics and Evolution. 232 (3–4): 213–236. doi:10.1007/s006060200044. JSTOR23644392. S2CID33581227.
Denk, Thomas; Grimm, Guido; Stogerer, K.; Langer, M.; Hemleben, Vera (2002). "The evolutionary history of Fagus in western Eurasia: Evidence from genes, morphology and the fossil record". Plant Systematics and Evolution. 232 (3–4): 213–236. doi:10.1007/s006060200044. JSTOR23644392. S2CID33581227.