F, S., R, M., & CL, Z. (2014). A healthy heart is not a metronome: An integrative review of the heart's anatomy and heart rate variability. Frontiers in psychology, 5, 1040. https://doi.org/10.3389/fpsyg.2014.01040
Chicago Style (17th ed.) CitationF, Shaffer, McCraty R, and Zerr CL. "A Healthy Heart Is Not a Metronome: An Integrative Review of the Heart's Anatomy and Heart Rate Variability." Frontiers in Psychology 5 (2014): 1040. https://doi.org/10.3389/fpsyg.2014.01040.
MLA (9th ed.) CitationF, Shaffer, et al. "A Healthy Heart Is Not a Metronome: An Integrative Review of the Heart's Anatomy and Heart Rate Variability." Frontiers in Psychology, vol. 5, 2014, p. 1040, https://doi.org/10.3389/fpsyg.2014.01040.
Warning: These citations may not always be 100% accurate.