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”. Архивирано из оригинала 2002-10-05. г. „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. Приступљено 26. 8. 2010. „rū'pya 10805 rū'pya 'beautiful, bearing a stamp' ; 'silver”CS1 одржавање: Формат датума (веза)
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. Приступљено 26. 8. 2010. „rūpa 10803 'form, beauty”CS1 одржавање: Формат датума (веза)
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„Mughal Coinage”. Архивирано из оригинала 2002-10-05. г. „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”
