e Frederic Troyon, Habitations lacustres.
f Victor Gross, Les Proto-helvétes.
g Elisée Reclus, The Lacustrian Cities of Switzerland (in Smithsonian Report for 1861).
h G. O. Montelius, De Chronologie der Pfahlbauten in Mittheilungen der Anthropologischen Gesellschaft in Wien. Vol. XXX.
i John Lubbock, Prehistoric Times.
j T. Studer, Pfahlfan Bevölkering in Zeit für Ethr. Verband, 1885.
k Rudolf Virchow, in letter prefixed to V. Gross, Les Proto-helvétes.
l Robert Munro, The Lake Dwellings of Europe.
m A. Vieusseux, The History of Switzerland.
n Michael Stettler, Annales.