1. Ainslie, W. 1826. Materia Indica, Vol. 2. Longman, Rees, Orme, Brown, and Green, London.
2. Alcorn, J. B. 1984. Huastec Mayan ethnobotany. University of Texas Press, Austin.
3. Aldini, T. 1625. Exactissima descriptio rariorum quarundam Plantarum …. Typus Iacobi Mascardi, Romae.
4. Allen, T. A. 1876. The encyclopedia of pure materia medica, Vol. 3. Boericke and Tafel, New York.
5. Austin, D. F. 1980. Convolvulaceae. Pages 288–363 in M. D. Dassanayake and F. R. Fosberg, eds., A revised handbook of the flora of Ceylon, Vol. I. Amerind Publishing Co, New Delhi.