1. Ibrahim, Mariam, Rahul Verma, and Lucila Garcia-Contreras. "Inhalation drug delivery devices: technology update." Medical Devices (Auckland, NZ) 8 (2015): 131.
2. Usmani, Omar S. "Choosing the right inhaler for your asthma or COPD patient." Therapeutics and clinical risk management 15 (2019): 461.
3. Taffet, George E., James F. Donohue, and Pablo R. Altman. "Considerations for managing chronic obstructive pulmonary disease in the elderly." Clinical Interventions in Aging 9 (2014): 23.
4. Sanchis, Joaquin, et al. "Systematic review of errors in inhaler use: has patient technique improved over time?." Chest 150.2 (2016): 394-406.
5. Vincken, Walter, et al. "Spacer devices for inhaled therapy: why use them, and how?." ERJ open research 4.2 (2018).