Gokhale, SB et al (2007). A text book of Pharmacognosy, Nirali Prakashan, Pune, pp. 25, 46, 47.
Heywood et al, (2007). Flowering Plant Families of the World, Royal Botanic Gardens, Kew, pp. 225, 226.
Watt, G (1908). The commercial Products of India. Secretary of State for India in Council. pp. 526–530.
Viable Herbal Solutions website.