Mukherjee, Bratindra Nath (2001), Nationhood and Statehood in India: A historical survey, Regency Publications, p. 3, ISBN 978-81-87498-26-1, <https://books.google.com/books?id=MTGKAAAAMAAJ>: "Apparently the same territory was referred to as Hi(n)du(sh) in the Naqsh‐i‐Rustam inscription of Darius I as one of the countries in his empire. The terms Hindu and India ('Indoi) indicate an original indigenous expression like Sindhu. The name Sindhu could have been pronounced by the Persians as Hindu (replacing s by h and dh by d) and the Greeks would have transformed the latter as Indo‐ (Indoi, Latin Indica, India) with h dropped..."
