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Grierson, G. A. (1903). Linguistic Survey of India, Vol. V, Part II.
Jain, Dinesh (26 July 2007). The Indo-Aryan Languages. p. 519. ISBN978-1135797119.
Bihar District Gazetteers: Shahabad. p. 130.
Fishman, Joshua A. (1993). The Earliest Stage of Language Planning: The "first Congress" Phenomenon. p. 119. ISBN3110135302.
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