Sinclair ZX Spectrum: a visual compendium | Bitmap Books
Sinclair ZX81: 30 years old • The Register
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
Sinclair ZX81 editorial image. Image of office, retro - 58635485
Sinclair ZX81 Desktop Computer - Bard Graduate Center