BASIC basics for the Timex Sinclair 1500, also for use with Timex 1000 and Sinclair ZX-81 computers: Barnett, Michael P: 9780835903486: Amazon.com: Books
Not Only 30 Programs for the Sinclair ZX81 (Retro Reproductions): Reproductions, Retro: 9781789825886: Amazon.com: Books
Sinclair ZX-81 computer
Amazon.com: Sinclair ZX81 Computer 1984 Patent Print - Office Poster Giclee Art Wall Decor Vintage Blueprint Gift - Frame Not Included : Handmade Products
Sinclair ZX81 System Story - Nostalgia Nerd
Amazon.com: Sinclair ZX81 Computer 1984 Patent Print - Office Poster Giclee Art Wall Decor Vintage Blueprint Gift - Frame Not Included : Handmade Products
ZX81: Small black box of computing desire - BBC News