Wu, Juan, Bi-Hua Wu, Li Cao, Xi-Gui Hu, Zheng-Jun Xu, and You-Liang Zheng. 2011. “Characterization of the Essential Oil in Leaves of Chimonanthus Praecox Var. Concolor”. Asian Journal of Chemistry 24 (4):1563-66. https://asianpubs.org/index.php/ajchem/article/view/8859.