Sackner-Bernstein JD (tháng 5 năm 2004). “Practical guidelines to optimize effectiveness of beta-blockade in patients postinfarction and in those with chronic heart failure”. The American Journal of Cardiology. 93 (9A): 69B–73B. doi:10.1016/j.amjcard.2004.01.029. PMID15144942.
Sackner-Bernstein JD (tháng 5 năm 2004). “Practical guidelines to optimize effectiveness of beta-blockade in patients postinfarction and in those with chronic heart failure”. The American Journal of Cardiology. 93 (9A): 69B–73B. doi:10.1016/j.amjcard.2004.01.029. PMID15144942.