1. W. Trelease, "Mem. Natl. Acad. Sci." 20, "The American oaks." 1 (1924)
2. "International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile 159." (2018)
3. G. Bentham, "Plantae Hartwegianae. [auct." (1839–1857)
4. A. de. Candolle, "Ordo CXC. Cupuliferae. 1. Quercus." (1864)
5. J. G. Cooper, "Smithson. Rep." 1858, "On the distribution of the forests and trees of North America, with notes on its physical geography." 261 (1859)