Richard F. Nyrop (2008). Area Handbook for the Persian Gulf States. Wildside Press. ISBN978-1-4344-6210-7. «... The Indian rupee was the principal currency until 1959, when it was replaced by a special gulf rupee to halt gold smuggling into India ...»
«Mughal Coinage». Արխիվացված է օրիգինալից 2002 թ․ հոկտեմբերի 5-ին. «Sher Shah issued a coin of silver which was termed the Rupiya. This weighed 178 grains and was the precursor of the modern rupee. It remained largely unchanged till the early 20th Century»
Turner, Sir Ralph Lilley (1985) [London: Oxford University Press, 1962–1966.]. «A Comparative Dictionary of the Indo-Aryan Languages». Includes three supplements, published 1969–1985. Digital South Asia Library, a project of the Center for Research Libraries and the University of Chicago. Վերցված է 2010 թ․ օգոստոսի 26-ին. «rū'pya 10805 rū'pya 'beautiful, bearing a stamp' ; 'silver'»
Turner, Sir Ralph Lilley (1985) [London: Oxford University Press, 1962–1966.]. «A Comparative Dictionary of the Indo-Aryan Languages». Includes three supplements, published 1969–1985. Digital South Asia Library, a project of the Center for Research Libraries and the University of Chicago. Վերցված է 2010 թ․ օգոստոսի 26-ին. «rūpa 10803 'form, beauty'»
unicode.org
Deka, Rabin (2010 թ․ հունվարի 25). «Additions to Deva-Nagariscript and Bengali script»(PDF). This proposal contains two attestations with a solid dot instead of a circle. Deka also points out that रु. is printed with a shorter head bar when used as the abbreviation for rupee.
«Mughal Coinage». Արխիվացված է օրիգինալից 2002 թ․ հոկտեմբերի 5-ին. «Sher Shah issued a coin of silver which was termed the Rupiya. This weighed 178 grains and was the precursor of the modern rupee. It remained largely unchanged till the early 20th Century»
