APA

Avi Kumar, University of Delhi. Faculty of Medical Sciences. Department of Respiratory Medicine, Dr. Ashok Shah Gu & University of Delhi. Faculty of Medical Sciences. Department of Respiratory Medicine. (2008). Occurrence of upper airway symptoms and their impact on quality of life in patients with chronic obstructive pulmonary disease. : .

Chicago

Avi Kumar, University of Delhi. Faculty of Medical Sciences. Department of Respiratory Medicine, Dr. Ashok Shah Gu and University of Delhi. Faculty of Medical Sciences. Department of Respiratory Medicine. 2008. Occurrence of upper airway symptoms and their impact on quality of life in patients with chronic obstructive pulmonary disease. : .

Harvard

Avi Kumar, University of Delhi. Faculty of Medical Sciences. Department of Respiratory Medicine, Dr. Ashok Shah Gu and University of Delhi. Faculty of Medical Sciences. Department of Respiratory Medicine. (2008). Occurrence of upper airway symptoms and their impact on quality of life in patients with chronic obstructive pulmonary disease. : .

MLA

Avi Kumar, University of Delhi. Faculty of Medical Sciences. Department of Respiratory Medicine, Dr. Ashok Shah Gu and University of Delhi. Faculty of Medical Sciences. Department of Respiratory Medicine. Occurrence of upper airway symptoms and their impact on quality of life in patients with chronic obstructive pulmonary disease. : . 2008.