Mahmud, W. M. H. W., Balakrishnan, M., & Perubatan, F. B. d. K. (2009). Comparative analysis for quantification of heart rate viability (HRV). Johor Bahru, Johor : Universiti Teknologi Malaysia.

Mahmud, Wan Mahani Hafizah Wan, Malarvili Balakrishnan, and Fakulti Biosains dan Kejuruteraan Perubatan. Comparative Analysis for Quantification of Heart Rate Viability (HRV). Johor Bahru, Johor : Universiti Teknologi Malaysia, 2009.

Mahmud, Wan Mahani Hafizah Wan, et al. Comparative Analysis for Quantification of Heart Rate Viability (HRV). Johor Bahru, Johor : Universiti Teknologi Malaysia, 2009.