Cf. The Greek anthology. Translated by Paton, W.R. New York: G.P. Putnam's and Sons. 1918. Book 14, §8. The Opposite Pairs of Numbers on a Die. The numbers on a die run so: six one, five two, three four.
Finkel, Irving (2008). "Board Games". Beyond Babylon: Art, Trade, and Diplomacy in the Second Millennium B.C. Metropolitan Museum of Art. p. 151. ISBN978-1-58839-295-4.
Guthrie, Kenneth (1988). The Pythagorean sourcebook and library: an anthology of ancient writings which relate to Pythagoras and Pythagorean philosophy. Grand Rapids, MI: Phanes Press. ISBN978-0-933999-50-3. OCLC255212063.