APA (7th ed.) Citation

Friedman, B. Validity concerns of common heart-rate variability indices. IEEE Engineering in medicine and biology magazine.

Chicago Style (17th ed.) Citation

Friedman, B.H. "Validity Concerns of Common Heart-rate Variability Indices." IEEE Engineering in Medicine and Biology Magazine .

MLA (9th ed.) Citation

Friedman, B.H. "Validity Concerns of Common Heart-rate Variability Indices." IEEE Engineering in Medicine and Biology Magazine, .

Warning: These citations may not always be 100% accurate.