APA (7th ed.) Citation

RG, B., & JK, S. (2002). Acute exacerbations of chronic obstructive pulmonary disease. New England Journal of Medicine, 347(19), 1533.

Chicago Style (17th ed.) Citation

RG, Barr, and Stoller JK. "Acute Exacerbations of Chronic Obstructive Pulmonary Disease." New England Journal of Medicine 347, no. 19 (2002): 1533.

MLA (9th ed.) Citation

RG, Barr, and Stoller JK. "Acute Exacerbations of Chronic Obstructive Pulmonary Disease." New England Journal of Medicine, vol. 347, no. 19, 2002, p. 1533.