Plato (1909). "Phædo (Dialogues of Plato)". In Charles W. Eliot (ed.). The Apology, Phædo and Crito of Plato – The Golden Sayings of Epictetus – The Meditations of Marcus Aurelius. The Harvard Classics. Vol. 2. Translated by Benjamin Jowett (1st ed.). New York: P. F. Collier and Son. p. 107. Retrieved May 16, 2020.
books.google.com
"Code of Federal Regulations: 1985–1999". U.S. General Services Administration, National Archives and Records Service, Office of the Federal Register. 5 November 1999. Archived from the original on 7 November 2017. Retrieved 5 November 2017 – via Google Books.
πάλλαArchived 2015-09-24 at the Wayback Machine, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
σφαίραArchived 2017-03-20 at the Wayback Machine, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
web.archive.org
"Code of Federal Regulations: 1985–1999". U.S. General Services Administration, National Archives and Records Service, Office of the Federal Register. 5 November 1999. Archived from the original on 7 November 2017. Retrieved 5 November 2017 – via Google Books.
πάλλαArchived 2015-09-24 at the Wayback Machine, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
σφαίραArchived 2017-03-20 at the Wayback Machine, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
