The Century computer programming course: The complete guide to programming in Sinclair BASIC using the ZX81 and Spectrum microcomputers: Peter, etc. Morse: 9780712600729: Amazon.com: Books
Sinclair ZX Spectrum A Visual Compendiu: 9780993012938: Amazon.com: Books
Sinclair ZX Spectrum A Visual Compendiu: 9780993012938: Amazon.com: Books
S2 E8 - 40 YEARS since the Sinclair ZX81 (and how it indirectly helped give us the M1) | The Constant Geekery Podcast | Podcasts on Audible | Audible.com