1. Bronchodialator alkaloid (vasicinone) from Adhatoda vasica;Amin;Nature,1959
2. Pathophysiology and pharmacology of cough;Bucher;Pharmacol. Rev.,1958
3. Antitussive properties of Butorphanol;Cavanagh;Arch. Int. Pharmacodyn.,1976
4. Charak Samhita, 1949. Translated by Shree Gulab Kunverba Ayurvedic Society, Jamnagar.
5. Statistical Methods Biological Assay, Ch. 20;Finney,1952