1. The Plant List (2013). http://www.theplantlist.org/, 2013, Version 1.1 (accessed September 2013).
2. Royal Botanic Gardens, Kew, Aloe World Checklist of Selected Plant Families. UK, 2013.
3. The State Commission of Pharmacopoeia, Pharmacopoeia of People’s Republic of China, The Medicine Science and Technology Press of China, Beijing, PRC, 2015, Part I, pp. 163.
4. Ministry of Food and Drug Safety, Korean Pharmacopoeia，South Korea, 2012, Part II, pp. 1300–1301.
5. Ministry of Health, Labour and Welfare, Japanese Pharmacopoeia, Japan, 2011, Part I, pp. 1596–1597.