Teh, Kong Chuan; Aziz, Abdul Rashid (April 2002). "Heart rate, oxygen uptake, and energy cost of ascending and descending the stairs". Medicine & Science in Sports & Exercise. 34 (4): 695–699. doi:10.1249/00005768-200204000-00021. PMID11932581.
Teh, Kong Chuan; Aziz, Abdul Rashid (April 2002). "Heart rate, oxygen uptake, and energy cost of ascending and descending the stairs". Medicine & Science in Sports & Exercise. 34 (4): 695–699. doi:10.1249/00005768-200204000-00021. PMID11932581.