Alfaroa
Bibliografia
- Elliott, L. L., Mindell, R. A., & Stockey, R. A., "Beardia vancouverensis Gen. et Sp. Nov. (Juglandaceae): Permineralized Fruits from the Eocene of British Columbia", American Journal of Botany 93(4): 557-565, 2006
- Manchester, Steven R., "Fossil Wood of the Engelhardieae (Junglandaceae) from the Eocene of North America: Engelhardioxylon Gen. Nov.", Bot. Gasz 144(1)157-163, 1983.
- J. A. Vozzo (ed.) Tropical Tree Seed Manual "Part II—Species Descriptions", USDA Forest Service
- KBD: Kew Bibliographic Databases of Royal Botanic Gardens, Kew
