ET-57
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Introduction to programming, TI Programmable 57 by Texas Instruments [1977] {510.28542--oclc} : Texas Instruments : Free Download, Borrow, and Streaming : Internet Archive
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Texas Instruments Programmable 57 Handheld Electronic Calculator | Smithsonian Institution
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Texas Instruments ti-57 Programmable calculator | eBay
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File:TI-59 programmable calculator.jpg - Wikimedia Commons
DATAMATH
TI-57 Programmable Calculator - Calculator - Computing History
Dr. Monk's DIY Electronics Blog: TI Programmable 57 Calculator Battery Conversion
