Kocher, Theodor; Stiles, Harold Jalland (7 January 1895). Text-book of operative surgery. London: Adam and Charles Black. Retrieved 7 January 2018 – via Internet Archive.
Several alternative spellings to Marie Witschi-Courant exist, for example
Maria Witschi (ref hls),
Witchi (ref choong2009),
Witchi-Cournant (ref tan2008),
Maria Witschi but in letters "Marie" (ref: Descriptor
Bonjour, Edgar (1981) [1950]. Theodor Kocher. Berner Heimatbücher (in German). Vol. 40/41 (2nd (2., stark erweiterte Auflage 1981) ed.). Bern: Verlag Paul Haupt. ISBN978-3258030296.
Gautschi, OP.; Hildebrandt, G.; Kocher, ET. (June 2009). "Emil Theodor Kocher (25/8/1841-27/7/1917)--A Swiss (neuro-)surgeon and Nobel Prize winner". Br J Neurosurg. 23 (3): 234–236. doi:10.1080/02688690902777658. PMID19533456. S2CID1622440.
Bonjour, Edgar (1950–1951). "Theodor Kocher". Schweizer Monatshefte: Zeitschrift für Politik, Wirtschaft, Kultur (in German). 30. doi:10.5169/seals-159844.