1. Hatha yoga pradipika;Muktibodhananda,2014
2. The gheranda samhita;Bahadur,2003
3. Hatha yoga pradipika. Shatkarma and pranayama: chapter 2, verse 22;Muktibodhananda,2014
4. The gheranda samhita. The training of the physical body: chapter 1, verse 51;Bahadur,2003
5. World Health Organization. Bronchial asthma n.d. Available from: http://www.who.int/mediacentre/factsheets/fs206/en/. [Accessed 10 May 2017].