1. National Research Council, Institute of Medicine. Children’s Health, The Nation’s Wealth: Assessing and Improving Child Health. Washington, DC: National Academies Press; 2004. p. 13-4.
2. Marynithya P, Devi VJ. Effectiveness of balloon blowing exercise. Am J Adv Nurs Res 2020;7:25-9.
3. Saikia D, Mahanta B. Cardiovascular and respiratory physiology in children. Indian J Anaesth 2019;63:690-7.
4. Simoes EA, Cherian T, Chow J, Shahid-Salles SA, Laxminarayan R, John TJ. Acute respiratory infections in children. In: Jamison DT, Breman JG, Measham AR, Alleyne G, Claeson M, Evans DB, et al., editors. Disease Control Priorities in Developing Countries. 2nd ed. Washington, DC: International Bank for Reconstruction and Development, The World Bank; 2006.
5. Ghai OP, Paul VK, Bagga A. Textbook of Essential Pediatrics. 9th ed. New Delhi: CBS Publishers and Distributers Pvt Ltd; 2019.