"A rare silver fraction recently identified as a coin of Themistocles from Magnesia even has a bearded portrait of the great man, making it by far the earliest datable portrait coin. Other early portraits can be seen on the coins of Lycian dynasts." Carradice, Ian; Price, Martin (1988). Coinage in the Greek World. Seaby. p. 84. ISBN9780900652820.
for Caesar: De Vita Caesarum, Divus Iulius, (The Lives of the Caesars, The Deified Julius), Fordham online text; for Pompey: Chapters 4–6 of Book 37 of the Natural History of Pliny the Elder give a summary art history of the Greek and Roman tradition, and of Roman collecting
jstor.org
CAHN, HERBERT A.; GERIN, DOMINIQUE (1988). "Themistocles at Magnesia". The Numismatic Chronicle. 148: 19. JSTOR42668124.
Sowder, Amy. "Ancient Greek Bronze Vessels", in Heilbrunn Timeline of Art History. New York: The Metropolitan Museum of Art, 2000–. online (April 2008)
