| Reference | Vickers 1980 | |
|---|---|---|
| Author | Steven Vickers | |
| Year | 1980 | |
| Title | Sinclair ZX81 BASIC Programming | |
| Publisher | Sinclair Research Limited | |
| Retrieved | 07 june 2006 | |
| URL | ftp://ftp.worldofspectrum.org/pub/sinclair/hardware-info/ZX81_BasicProgramming.pdf |
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