↑ a b Hugh, Samuel Roger Elliot (1912). Sir Sidney Lee, ed. ↑ a b c d e Hugh, Samuel Roger Elliot (1912). Sir Sidney Lee, camiseta del manchester city ed. ↑ a b c d Schiller, Ferdinand Canning Scott (1911). Hugh Chisholm, ed. ↑ a b Schiller, Ferdinand Canning Scott (1911). Hugh Chisholm, ed. ↑ Entwistle (1965), pp. ↑ Carlo Pizzigoni (2012). «Del Piero, Australia subito amara.
