Isabel Maldonado. "The Urdu language reforms." Studies 26 (2011): 97. Asher, R. E. (Ed.). (1994). The Encyclopedia of language and linguistics. Oxford: Pergamon
Encyclopedia of Language and Linguistics 2. Elsevier. 2005. ISBN 0-08-044299-4. Sequence of events with reference to official language of the Union. [2015-04-23]
ISBN 0520228219 Abidi, S. A. H.; Gargesh, Ravinder, Persian in South Asia, Language in South Asia (Cambridge: Cambridge University Press), 2008: 103–120,