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Moreira de Lacerda, Geraldo (author / autor). "O Cometa de Halley, O Sinal do Fim do Mundo", portada - University of Texas Libraries Collections. 1985. https://exhibits.lib.utexas.edu/spotlight/hemisphere-of-knowledge/catalog/59-1912APA
Moreira de Lacerda, Geraldo (author / autor). (1985). "O Cometa de Halley, O Sinal do Fim do Mundo", portada. Retrieved January 15, 2025, from https://exhibits.lib.utexas.edu/spotlight/hemisphere-of-knowledge/catalog/59-1912Chicago
Moreira de Lacerda, Geraldo (author / autor). "O Cometa de Halley, O Sinal do Fim do Mundo", portada. 1985. "O Cometa de Halley, O Sinal do Fim do Mundo", portada – Collections". University of Texas Libraries Collections. <https://exhibits.lib.utexas.edu/spotlight/hemisphere-of-knowledge/catalog/59-1912> (15-January-2025).Note that these citations have been automatically generated, please verify that citation is correct and contains all necessary information.