James Prinsep e Henry Thoby Prinsep, Essays on Indian antiquities, historic, numismatic, and palæographic, of the late James Prinsep: to which are added his useful tables, illustrative of Indian history, chronology, modern coinages, weights, measures, etc (1858), Eras of Ancient and Modern Times, The Grecian Era, or Era of the Seleucids p.141 [google books]
