L-F. Zhu, Y-H. Li, B-L. Li, B-Y. Lu and N-H. Xia, Aromatic plants and essential constituents, South China Institute of Botany, Chinese Academy of Sciences, Hai Feng Publish, Co. Distributed by Peace Book Co., Ltd., Hong Kong (1993).

P&F 26, No. 1, 36, (2001) Allured Publishing Corporation, Carol Stream, IL.