Scharf, S. M., Bianco, J. A., Tow, D. E., & Brown, R. (1981). The effects of large negative intrathoracic pressure on left ventricular function in patients with coronary artery disease. Circulation (New York, N.Y.), 63(4), 871-875. https://doi.org/10.1161/01.CIR.63.4.871
Chicago Style (17th ed.) CitationScharf, S M., J A. Bianco, D E. Tow, and R. Brown. "The Effects of Large Negative Intrathoracic Pressure on Left Ventricular Function in Patients with Coronary Artery Disease." Circulation (New York, N.Y.) 63, no. 4 (1981): 871-875. https://doi.org/10.1161/01.CIR.63.4.871.
MLA (9th ed.) CitationScharf, S M., et al. "The Effects of Large Negative Intrathoracic Pressure on Left Ventricular Function in Patients with Coronary Artery Disease." Circulation (New York, N.Y.), vol. 63, no. 4, 1981, pp. 871-875, https://doi.org/10.1161/01.CIR.63.4.871.