Adams, John Quincy. The Diary of John Quincy Adams 1794-1845，American Political, Social and Intellectual Life from Washington to Polk. 1928. Ed. Allan Nevins. New York, London, Toronto: Longmans, Green & Co., 1951. Internet Archive.

Alighieri, Dante Paradiso XIX 118-120. Trans. Allen Mandelbaum. Digital Dante.

Beebe, Charles W. Beneath Tropic Seas. New York: G. P. Putnam’s Sons, 1928. Internet Archive.

Douglas, Clifford Hugh. Credit Power and Democracy. London: Cecil Palmer, 1921. Internet Archive.

Douglas, Clifford Hugh. The New and The Old Economics. 1932. Sydney: Tidal Publications, 2001. The Cantos Project.

Frobenius, Leo. Erlebte Erdteile. Vol. V. Frankfurt: 1928. 

Hatvany, Ludwig. Das verwundete Land. Leipzig, Wien, Zürich: E. P. Tal & Co. <Verlag, 1921. Internet Archive.

Kimball, Dexter. Industrial Economics. New York: 1929. Hathi Trust.

Lévy-Bruhl, Lucien. How Natives Think. London: 1926. Internet Archive.

Lewinsohn Richard. The Man behind the Scenes: The Career of Basil Zaharoff. Paris: 1929.

Sachetti, Franco. Novelle. 181. Florence: 1724. Wikisource.

Zappa, Paolo. I mercanti di cannoni. Milano: Edizioni Corbaccio, 1932.

Note on Sources