गोपाल राय (Gopal Rai) हिन्दी भाषा का विकास Hindi bhasha ka vikas - Patna Anupam prakasan 1995 - 279p. Subjects--Topical Terms: Official languageBhasha vijnan- hindiभाषा विज्ञान- हिन्दी Dewey Class. No.: 811(H)'244 / GOP/H