↑ Tyrrell, John (2001). The new Grove dictionary of music and musicians: Volume 21.
↑ Jeff Wallenfeldt (10 April 2018). "Luiz Inácio Lula da Silva". Encyclopædia Britannica. Archived from the original on 2 July 2019. Retrieved 27 July 2018.
↑ Suárez, José I., and Tomlins, Jack E., Mário de Andrade: The Creative Works (Cranbury, New Jersey: Associated University Presses, 2000).
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