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The Spectrum of Adventure: A Brief History of Interactive Fiction on the Sinclair ZX Spectrum by Thomas A. Christie | Goodreads
The Sinclair ZX Spectrum Turns 40 | Hackaday
ZX Spectrum - Wikipedia
Computing History on Twitter: "The Sinclair ZX Spectrum +2 with built in tape drive. Now your games will only fail to load 40% of the time!! ;) http://t.co/iLKLInDTXI" / Twitter
Sinclair ZX Spectrum A Visual Compendiu: 9780993012938: Amazon.com: Books
The ZX Spectrum Ula: How to Design a Microcomputer (ZX Design Retro Computer): Smith, Christopher David: 9780956507105: Amazon.com: Books