1. “The Rationale and Results of Breathing Exercises for Asthma”;Bolton;Med J Aust,1956
2. The Respiratory Muscles and Mechanics of Breathing;Campbell,1958
3. “Action of Breathing Exercises in Pulmonary Emphysema”;Campbell;Lancet,1955
4. COMROE, JULIUS H. and others (1955): The Lung. Year Book Publishers, Chicago.
5. “The Rationale, Methods and Results of Breathing Exercises for Asthma”;Ross;THE AUSTRALIAN JOURNAL OF PHYSIOTHERAPY,1958