APA (7th ed.) Citation
SA, A., H, T., & A, S. (2008). Aortic valve closure: Relation to tissue velocities by Doppler and speckle tracking in normal subjects. European Journal of Echocardiography, 9(4), 555-560.
Chicago Style (17th ed.) Citation
SA, Aase, Torp H, and Støylen A. "Aortic Valve Closure: Relation to Tissue Velocities by Doppler and Speckle Tracking in Normal Subjects." European Journal of Echocardiography 9, no. 4 (2008): 555-560.
MLA (9th ed.) Citation
SA, Aase, et al. "Aortic Valve Closure: Relation to Tissue Velocities by Doppler and Speckle Tracking in Normal Subjects." European Journal of Echocardiography, vol. 9, no. 4, 2008, pp. 555-560.
Warning: These citations may not always be 100% accurate.