Usborne Computer Books Better Basic - Smith PB Acorn Sinclair CBM ZX81

BYTE The Small system journal Oktober 1986 zB Apple II GS

The ZX81 Companion - Book - Bob Maunder - Linsac - 1981

Original Roland DXY-1100 / 1200 / 1300 Command Reference Plotter Manual

Hints & Tips For The ZX81 - Book - Andrew Hewson - 1981

The Gateway Guide To ZX81 ZX80 - Book - Interface - Mark Charlton 1982

Usborne Computer Book Programming Handbook Basic Machine Code Acorn ZX81 CBM VIC

Sixty Programs for the Sinclair ZX Spectrum Book - PCN - Erskine