APA (7th ed.) Citation

Huikuri, H. V., Mäkikallio, T., Airaksinen, K. E., Mitrani, R., Castellanos, A., & Myerburg, R. J. (1999). Measurement of heart rate variability: A clinical tool or a research toy? Journal of the American College of Cardiology, 34(7), 1878. https://doi.org/10.1016/S0735-1097(99)00468-4

Chicago Style (17th ed.) Citation

Huikuri, H V., T. Mäkikallio, K E. Airaksinen, R. Mitrani, A. Castellanos, and R J. Myerburg. "Measurement of Heart Rate Variability: A Clinical Tool or a Research Toy?" Journal of the American College of Cardiology 34, no. 7 (1999): 1878. https://doi.org/10.1016/S0735-1097(99)00468-4.

MLA (9th ed.) Citation

Huikuri, H V., et al. "Measurement of Heart Rate Variability: A Clinical Tool or a Research Toy?" Journal of the American College of Cardiology, vol. 34, no. 7, 1999, p. 1878, https://doi.org/10.1016/S0735-1097(99)00468-4.