History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
Other ambassadors of the Syracusans and Corinthians were also sent to Lacedaemon and Corinth, in order that a fresh force might be sent over to them, in whatever way might answer best, whether in merchantmen, or boats, or any how else; since the Athenians too were sending for reinforcements.