The Ultimate Guide to Games for the ZX Spectrum: 3rd edition: Green, Andrew J: 9781507896020: Amazon.com: Books
Sinclair ZX81: 30 years old • The Register
Better Programming for Your Spectrum and Z.X.81: Amazon.co.uk: Speel, S.Robert: 9780006366102: 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
Amazon.co.jp: Better Programming for Your Spectrum and Z.X.81 : 本
Inside the Sinclair ZX81 - by Paul Lefebvre
Amazon.co.jp: Century Computer Programming Course: Complete Sinclair BASIC Manual for Z.X.81 and Spectrum Users : Morse, Peter, etc.: 洋書
Sinclair ZX Spectrum: a visual compendium: Amazon.co.uk: Bitmap Books: 9780993012938: Books | Video game stores, Book publishing, Compendiums
A Compendium of ZX Spectrum Games - Volume One: Hawken, Kieren: 9781789821291: Amazon.com: Books
ZX Spectrum Vega ZX81 Sinclair Research Computer, Computer, electronics, computer, video Game png | PNGWing
Remembering the Sinclair ZX Spectrum — Happy 40th Birthday | Medium