1. Essential oils. In Citrus Science and Technology, (eds). The AVI Publishing Co. Inc.: Westport, CT, 1977; 427.
2. Horticultural varieties of citrus. In The Citrus Industries, vol. 1. (eds). A Centennial Publication of the University of California: Berkeley, CA, 1967; 431.
3. Do Dinh Ca. Proceedings of the National Workshop on Strengthening of Plant Genetic Resources Program. Research Institute of Fruit and Vegetables: Hanoi, 1995 (in Vietnamese).
4. Do Tat Loi. Vietnamese Medicinal Plants. Science and Technique Publisher: Hanoi, 1986 (in Vietnamese).
5. Review of quantitative analyses of citrus essential oils