Cartão perfurado (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Cartão perfurado" in Portuguese language version.

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bitsavers.org

IBM (1962). Reference Manual 1401 Data Processing System (PDF). [S.l.]: IBM. p. 10. A24-1403-5. The IBM 1402 Card Read-Punch provides the system with simultaneous punched-card input and output. This unit has two card feeds.

«AN ELECTRIC TABULATING SYSTEM.»
da Cruz, Frank (28 de agosto de 2019). «Herman Hollerith». Columbia University Computing History. Columbia University. Consultado em 9 de março de 2020. After some initial trials with paper tape, he settled on punched cards...