1. Contribution to the Flora of New Jersey Torreya;Clausen,1939
2. Plantarum Sinensium. Ecloge Tertia. J. de Bot;Franchet,1899
3. J. Am. Chem. Soc;Herty,1908
4. Li, H. L., personal communication.
5. Check list of native and naturalized trees, U. S. Dept. Agr. Handbook;Little,1953