[5] Peter Voswinckel and Nils Hansson, "Ernst von Leyden (1832-1910): a pioneer in making oncology a respected medical discipline" – Journal of Cancer Research and Clinical Oncology, 21 July 2021
google.nl
books.google.nl
[3] Ernst von Leyden, Lebenserinnerungen. Gearchiveerd op 2 juli 2023.
[4] Handbuch der Ernährungstherapie, tweede druk 1903–04. Gearchiveerd op 2 juli 2023.