„Wilhelm Röntgen“. University of Washington: Department of Radiology (7-yanvar 2015-yil). 2022-yil 7-oktyabrda asl nusxadan arxivlangan. Qaraldi: 2020-yil 18-may.
web.archive.org
„Wilhelm Röntgen“. University of Washington: Department of Radiology (7-yanvar 2015-yil). 2022-yil 7-oktyabrda asl nusxadan arxivlangan. Qaraldi: 2020-yil 18-may.