* John R. Scherer: Before cardiac MRI: Rene Laennec (1781–1826) and the invention of the stethoscope. i Cardiology Journal. Bd. 14, Nr. 5, 2007, ISSN 1897-5593, S. 518–519, PMID 18651515.
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* John R. Scherer: Before cardiac MRI: Rene Laennec (1781–1826) and the invention of the stethoscope. i Cardiology Journal. Bd. 14, Nr. 5, 2007, ISSN 1897-5593, S. 518–519, PMID 18651515.