Information, National Center for Biotechnology; Pike, U. S. National Library of Medicine 8600 Rockville; MD, Bethesda; Usa, 20894. How does the blood circulatory system work?. Institute for Quality and Efficiency in Health Care (IQWiG). 2019-01-31 [2019-05-24]. (原始内容存档于2022-01-29) (英语).
Information, National Center for Biotechnology; Pike, U. S. National Library of Medicine 8600 Rockville; MD, Bethesda; Usa, 20894. How does the blood circulatory system work?. Institute for Quality and Efficiency in Health Care (IQWiG). 2019-01-31 [2019-05-24]. (原始内容存档于2022-01-29) (英语).