The lack of complete and reliable information as to whom the credit for the design belongs, led to innumerable speculations. Scholars suggest the story of Ustad Isa was born of the eagerness of the British in the 19th century to believe that such a beautiful building should be credited to a European architect. Local informants were reported to have sated British curiosity regarding the origins of the Taj by also supplying them with fictitious lists of workmen and materials from all over Asia. Typically, he is described as a Persian architect.
Recent research suggests the Persian architect, Ustad Ahmad Lahauri was the most likely candidate as the chief architect of the Taj, an assertion based on a claim made in writings by Lahauri's son Lutfullah Muhandis.
- UNESCO advisory body evaluation
- Asher, p.212
- Begley and Desai, p.65
- Asher, Catherine Ella Blanshard (2003). The New Cambridge History of India, Vol I:4 - Architecture of Mughal India (First published 1992, reprinted 2001,2003 ed.). Cambridge: Cambridge University Press. p. 368. ISBN 0-521-26728-5.
- Begley, Wayne E.; Desai, Z.A. (1989). Taj Mahal - The Illumined Tomb. University of Washington Press. p. 392. ISBN 978-0-295-96944-2.
- Koch, Ebba (Aug 2006). The Complete Taj Mahal: And the Riverfront Gardens of Agra (First ed.). Thames & Hudson Ltd. ISBN 0-500-34209-1.